Corporate and Other Corporate Reconciling Items And Eliminations [Member] Corporate Reconciling Items And Eliminations [Member] Receivables Settlement Assets, Current, Receivables Settlement Assets, Current, Receivables Actuarial gain (loss) Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) State Current State and Local Tax Expense (Benefit) Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Lessor lease term, sales-type leases (in months and years) Lessor, Sales-type Lease, Term of Contract Schedule of total purchase price paid Schedule of Business Acquisitions, by Acquisition [Table Text Block] Net income per share attributable to Fiserv, Inc., Basic (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Basic Goodwill Goodwill Disclosure [Text Block] Transaction expenses Business Combination, Acquisition Related Costs Other intangible assets, net Other intangible assets Other Intangible Assets [Member] Capitalized software development costs Deferred Tax Liabilities, Deferred Expense, Capitalized Software Contract costs Increase (Decrease) in Contract with Customer, Asset Number of plan asset investment pools Defined Benefit Plan, Plan Assets, Target Allocation, Number Of Investment Pools Defined Benefit Plan, Plan Assets, Target Allocation, Number Of Investment Pools Security Exchange Name Security Exchange Name Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Total fair value of cash flow hedge derivatives Cash Flow Hedges Derivative Instruments at Fair Value, Net Contract with customer, asset and liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Payment for Contingent Consideration Liability, Financing Activities Payment for Contingent Consideration Liability, Financing Activities Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items] Operating leases Operating Lease, Weighted Average Remaining Lease Term Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Investment, Name [Axis] Investment, Name [Axis] Derivatives Derivatives, Policy [Policy Text Block] Share-based awards available for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Net change in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table] Business Acquisition, Pro Forma Information, Nonrecurring Adjustments [Table] Operating lease income Operating Lease, Lease Income 2023 Long-Term Debt, Maturity, Year Two Intangible assets Deferred Tax Liabilities, Intangible Assets First Data Joint Venture First Data Joint Venture [Member] First Data Joint Venture [Member] Total intrinsic value of stock options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Cash distributions from unconsolidated affiliate Proceeds From Equity Method Investment, Distribution, Operating And Investing Activities Proceeds From Equity Method Investment, Distribution, Operating And Investing Activities Measurement period adjustment, increase (decrease) in goodwill Goodwill, Purchase Accounting Adjustments Consolidated indebtedness to consolidated net earnings limit Debt Instrument Terms For Line Of Credit, Debt To Income Ratio Debt Instrument Terms For Line Of Credit, Debt To Income Ratio Charged to Costs and Expenses SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense Subsequent Event Type [Domain] Subsequent Event Type [Domain] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Deferred income taxes Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Amortization expense Amortization of Intangible Assets Schedule of changes in reserves Schedule of Restructuring Reserve by Type of Cost [Table Text Block] Interest income Sales-type and Direct Financing Leases, Interest Income Weighted-average useful life (in years) Weighted-Average Useful Life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Increases for tax positions taken in prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Proceeds from issuance of treasury stock Proceeds from Issuance or Sale of Equity Operating leases Operating Lease, Weighted Average Discount Rate, Percent Weighted-average shares excluded from calculations of common stock equivalents for anti-dilutive stock options Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Revenue recognized which was included in the contract liability balance Contract with Customer, Liability, Revenue Recognized Foreign currency translation adjustment, tax Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), After Reclassification, Tax Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), After Reclassification, Tax Measurement period adjustment, fair value of property and equipment Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Business Combination and Asset Acquisition [Abstract] Business Acquisition [Axis] Business Acquisition [Axis] Variable interest rate (as a percent) Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate Aggregate merchant credit losses incurred Loss Contingency, Loss in Period Lessor, Lease, Description [Table] Lessor, Lease, Description [Table] 3.800% senior notes due October 2023 3.8% Senior Notes Due 2023 [Member] 3.8% Senior Notes Due 2023 [Member] 3.200% senior notes due July 2026 3.2% Senior Notes Due July 2026 [Member] 3.2% Senior Notes Due July 2026 [Member] Award Type [Domain] Award Type [Domain] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Local Phone Number Local Phone Number Contingent debt guarantee Guarantor Obligations, Current Carrying Value Capitalized commissions Deferred Tax Liabilities, Deferred Expense, Capitalized Commissions Deferred Tax Liabilities, Deferred Expense, Capitalized Commissions Weighted- Average Remaining Contractual Term (Years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Stock options exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Term loan and senior notes Loans Payable And Senior Notes [Member] Loans Payable And Senior Notes [Member] Decrease in unrecognized tax benefits reasonably possible Decrease in Unrecognized Tax Benefits is Reasonably Possible New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Preferred stock, no par value: 25 million shares authorized; none issued Preferred Stock, Value, Issued Distributions paid to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Currency [Axis] Currency [Axis] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Retained Earnings Retained Earnings [Member] Long-term debt: Long-term Debt, Other Disclosures [Abstract] Selling profit Sales-type and Direct Financing Leases, Profit (Loss) Total debt Debt Instrument, Fair Value Disclosure Short-term and current maturities of long-term debt: Debt, Current [Abstract] First Data Subsidiary Merchant Matters First Data Subsidiary Merchant Matters [Member] First Data Subsidiary Merchant Matters [Member] Leasing right-of-use assets Deferred Tax Liabilities, Leasing Arrangements Percentage of interest in joint venture Percentage of interest in joint venture Noncontrolling Interest, Ownership Percentage by Parent Measurement period adjustment, noncontrolling interests Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Equity Interests Net operating loss carryforwards: Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract] Distributions from unconsolidated affiliates Proceeds from Equity Method Investment, Distribution Trade accounts receivable Increase (Decrease) in Accounts Receivable Pre-tax gain Gain on deconsolidation Deconsolidation, Gain (Loss), Amount Expire 2027 Tax Year 2027 [Member] Tax Year 2027 [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Average interest rate (as a percent) Debt, Weighted Average Interest Rate Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Tax Period [Domain] Tax Period [Domain] Financing cash flows from finance leases Finance Lease, Principal Payments Net income attributable to Fiserv, Inc. per share – basic (in dollars per share) Earnings Per Share, Basic Revenue Recognition Revenue from Contract with Customer [Text Block] Document Information [Line Items] Document Information [Line Items] Acquired cash Cash Acquired from Acquisition Finxact Finxact [Member] Finxact Balance at beginning of period (in shares) Balance at end of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Acquisitions and valuation adjustments Goodwill, Acquired During Period And Purchase Accounting Adjustments Goodwill, Acquired During Period And Purchase Accounting Adjustments 2022 Long-Term Debt, Maturity, Year One Geographic Concentration Risk Geographic Concentration Risk [Member] Furniture and equipment Furniture And Equipment [Member] Furniture And Equipment [Member] Stock price achievement of common stock (in dollars per share) Business Combination, Equity Awards Granted At Initial Public Offering Subject To Vesting Upon Stock Price Achievement, Share Price Business Combination, Equity Awards Granted At Initial Public Offering Subject To Vesting Upon Stock Price Achievement, Share Price Fair Value Measurement [Domain] Fair Value Measurement [Domain] Schedule II - Valuation and Qualifying Accounts SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] Net cash provided by investing activities Cash Provided by (Used in) Investing Activities, Discontinued Operations Contract costs, net Capitalized Contract Cost, Net Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Payment instruments outstanding Settlement Liabilities, Current, Payment Instruments Outstanding Settlement Liabilities, Current, Payment Instruments Outstanding Commercial Paper Commercial Paper [Member] Total Deferred Tax Liabilities, Net Property and equipment Deferred Tax Liabilities, Property, Plant and Equipment Number of entities to dispose Number of entities sold Disposal Groups, Including Discontinued Operations, Number Of Entities Held For Sale Disposal Groups, Including Discontinued Operations, Number Of Entities Held For Sale Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Depreciation and other amortization Other Depreciation and Amortization Schedule of settlement assets and obligations Schedule Of Settlement Assets And Obligations [Table Text Block] Schedule Of Settlement Assets And Obligations [Table Text Block] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Net income attributable to Fiserv, Inc. Business Acquisition, Pro Forma Income (Loss), Including Portion Attributable To Noncontrolling Interest Business Acquisition, Pro Forma Income (Loss), Including Portion Attributable To Noncontrolling Interest Entity Voluntary Filers Entity Voluntary Filers Defined Benefit Plan, Plan Assets, Category [Domain] Defined Benefit Plan, Plan Assets, Category [Domain] Short-term and current maturities of long-term debt Long-term Debt and Lease Obligation, Current Outstanding debt Long-term Debt Client deposits Contract With Customer, Liability, Customer Deposits, Current Contract With Customer, Liability, Customer Deposits, Current Distributions from unconsolidated affiliates Proceeds from Equity Method Investment, Distribution, Return of Capital Level 1 Fair Value, Inputs, Level 1 [Member] Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Entity Small Business Entity Small Business Operating Leases, under ASC 842 Lessee, Operating Lease, Liability, Payment, Due [Abstract] Increases for tax positions taken during the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Scenario [Axis] Scenario [Axis] Schedule of components of lease income Sales-type Lease, Lease Income [Table Text Block] Liabilities and Equity Liabilities and Equity [Abstract] Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate 2024 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Three Accounts payable and accrued expenses Total Accounts Payable and Accrued Liabilities, Current Software obtained under financing arrangements Financed Software Arrangements Financed Software Arrangements SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table] Lessor lease term, operating leases (in months and years) Lessor, Operating Lease, Term of Contract Debt repayments Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security Entity Interactive Data Current Entity Interactive Data Current Thereafter Long-Term Debt, Maturity, after Year Five 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Four Capitalized Contract Cost [Table] Capitalized Contract Cost [Table] Interest Expense, Net Interest Expense, Policy [Policy Text Block] Decreases for settlements Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Expire 2022 through 2041 Tax Year 2022 Through 2041 [Member] Tax Year 2022 Through 2041 [Member] Noncontrolling Interest [Abstract] Noncontrolling Interest [Abstract] Affiliated Entity Affiliated Entity [Member] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Unrecognized tax benefits - Beginning of year Unrecognized tax benefits - End of year Unrecognized Tax Benefits Income Tax Authority [Domain] Income Tax Authority [Domain] Subtotal Deferred Tax Assets, Gross Schedule of operating loss carryforwards and general business credit carryforwards Summary of Operating Loss Carryforwards [Table Text Block] Thereafter Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, after Year Five Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Estimate of gain related to foreign currency exchange contracts during the next 12 months Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months Entity Address, State or Province Entity Address, State or Province Leases Lessee, Finance Leases [Text Block] Employee severance and other separation costs accrual Restructuring reserve, beginning balance Restructuring reserve, ending balance Restructuring Reserve Noncurrent assets Deferred Income Tax Assets, Net Accrued compensation and benefits Accrued Employee Benefits, Current U.K. plan UNITED KINGDOM Shares issued to acquire First Data (see Note 4) Stock Issued During Period, Value, Acquisitions Current: Liabilities, Current [Abstract] Revision of Prior Period [Axis] Revision of Prior Period [Axis] Measurement period adjustments, reduction to investments in unconsolidated entities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Investments In Unconsolidated Affiliates Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Investments In Unconsolidated Affiliates Stock options exercisable (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Capitalized Contract Cost [Line Items] Capitalized Contract Cost [Line Items] Accrued interest expense and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Accounting Policies [Abstract] Accounting Policies [Abstract] 2025 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Stock options outstanding (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Derivative Instrument [Axis] Derivative Instrument [Axis] Weighted-average discount rate: Leases Weighted Average Discount Rate [Abstract] Leases Weighted Average Discount Rate [Abstract] Retirement Plan Sponsor Location [Axis] Retirement Plan Sponsor Location [Axis] Other long-term assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Federal Current Federal Tax Expense (Benefit) Present value of lease liabilities Operating Lease, Liability Redeemable Noncontrolling Interests Beginning balance Ending balance Redeemable Noncontrolling Interest, Equity, Carrying Amount Document Transition Report Document Transition Report Common stock, $0.01 par value: 1,800 million shares authorized; 784 million and 789 million shares issued, respectively Common Stock, Value, Issued Finance leases Finance Lease, Weighted Average Discount Rate, Percent Weighted-average period unrecognized compensation cost will be recognized Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Balance at beginning of period (in dollars per share) Balance at end of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Leases Lessee, Operating Leases [Text Block] Amortization of right-of-use assets Finance Lease, Right-of-Use Asset, Amortization Funded status of the plans Defined Benefit Plan, Funded (Unfunded) Status of Plan ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Schedule of assumptions used to determine fair value of stock options assumed in acquisition Schedule of assumptions used to determine fair value of stock options granted Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of additional information related to stock option and restricted stock unit activity Share-based Payment Arrangement, Activity [Table Text Block] Ownership [Axis] Ownership [Axis] Foreign Deferred Foreign Income Tax Expense (Benefit) Accelerated amortization expense Restructuring And Related Cost, Accelerated Amortization Restructuring And Related Cost, Accelerated Amortization Legal Entity [Axis] Legal Entity [Axis] Goodwill [Line Items] Goodwill [Line Items] Class of Stock [Axis] Class of Stock [Axis] Net income Business Acquisition, Pro Forma Net Income (Loss) Interest expense, net Interest Income (Expense), Net Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Schedule of unrecognized tax benefits Summary of Income Tax Contingencies [Table Text Block] Income Tax Authority [Axis] Income Tax Authority [Axis] Indian Rupee India, Rupees Pre-tax gain from remeasurement Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Thereafter Finance Lease, Liability, to be Paid, after Year Five Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Ondot Ondot Systems, Inc. [Member] Ondot Systems, Inc. Processing, administrative service, and other fees Revenue from Related Parties Entity [Domain] Entity [Domain] Selling, General and Administrative Expenses Selling, General and Administrative Expenses [Member] Revenue Revenue from Contract with Customer, Excluding Assessed Tax Product development expenditures as percentage of total revenue Product Development Expenditures as Percentage of Revenue Product development expenditures as percentage of revenue. Share-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Sales Commissions Sales Commissions [Member] Sales Commissions [Member] Assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] Gross software development costs capitalized Capitalized Computer Software, Additions Stock options Share-based Payment Arrangement, Option [Member] Equity [Abstract] Equity [Abstract] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Accounts receivable from securitization Accounts Receivable from Securitization Business Segment Information Segment Reporting Disclosure [Text Block] Finance leases Finance Lease, Weighted Average Remaining Lease Term Total lease assets Lease, Right-Of-Use Asset Lease, Right-Of-Use Asset Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Document Fiscal Year Focus Document Fiscal Year Focus Additional Paid-In Capital Additional Paid-in Capital [Member] BentoBox BentoBox CMS, Inc. [Member] BentoBox CMS, Inc. Employer contribution (as percent) Defined Contribution Plan, Maximum Additional Annual Contributions Per Employee, Percent Defined Contribution Plan, Maximum Additional Annual Contributions Per Employee, Percent Repaid debt Repayments of Debt 2027-2031 Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Revenue of acquiree since acquisition date Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Equity Method Investment, Nonconsolidated Investee [Axis] Equity Method Investment, Nonconsolidated Investee [Axis] Transfers Goodwill, Transfers Other income (expense) Other Nonoperating Income (Expense) Number of shares to be repurchased (in shares) Stock Repurchased and Retired During Period, Shares Other investing activities Payments for (Proceeds from) Other Investing Activities Maximum Maximum [Member] Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Related Party Fees Related Party Fees [Member] Related Party Fees [Member] Award Type [Axis] Award Type [Axis] Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] 2.250% senior notes due June 2027 2.25% Senior Notes Due 2027 [Member] 2.25% Senior Notes Due 2027 [Member] U.S. and other plans United States And Other Foreign Pension Plans Defined Benefit [Member] United States And Other Foreign Pension Plans Defined Benefit [Member] Operating lease maturity Lessee, Operating Lease, Liability, Maturity [Table Text Block] Total Fiserv, Inc. shareholders’ equity Stockholders' Equity Attributable to Parent Foreign tax law changes Effective Income Tax Rate Reconciliation, Change In Enacted Foreign Tax Rate, Percent Effective Income Tax Rate Reconciliation, Change In Enacted Foreign Tax Rate, Percent City Area Code City Area Code Accounts payable and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Stock options exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Prepaid expenses and other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets Investment in Unconsolidated Affiliate Equity Method Investments and Joint Ventures Disclosure [Text Block] Schedule of supplemental cash flow information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Intangible Assets Intangible Assets Disclosure [Text Block] Estimated Useful Lives Property, Plant and Equipment, Useful Life Share price of shares issued for acquisition (in dollars per share) Business Acquisition, Share Price Fiserv, Inc. Shareholders’ Equity: Stockholders' Equity Attributable to Parent [Abstract] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Pre-tax gain on sale Gain on sale of business Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal Operating lease liabilities Operating Lease, Liability, Noncurrent 2022 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year One Total lease payments Finance Lease, Liability, Payment, Due Accounting Standards Update [Axis] Accounting Standards Update [Axis] Total current Current Income Tax Expense (Benefit) Debt instrument, face amount Debt Instrument, Face Amount Net periodic benefit income Defined Benefit Plan, Net Periodic Benefit Cost (Credit) 2.650% senior notes due June 2030 2.65% Senior Notes Due 2030 [Member] 2.65% Senior Notes Due 2030 [Member] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Operating segments Operating Segments [Member] Selling, General and Administrative Expenses Selling, General and Administrative Expenses, Policy [Policy Text Block] Schedule of purchase price allocation Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Revision of Prior Period [Domain] Revision of Prior Period [Domain] Charged to Other Accounts SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account Present value of lease liabilities Finance Lease, Liability 2.250% Senior Notes due 2025 Senior Notes Due 2025 [Member] Senior Notes Due 2025 [Member] Total deferred tax liabilities Deferred Tax Liabilities, Gross Employer contribution (as percent) Defined Contribution Plan, Employer Matching Contribution, Percent of Match Operating leases, remaining lease term (in months and years) Lessee, Operating Lease, Remaining Lease Term Business Acquisition [Line Items] Business Acquisition [Line Items] Equity securities Defined Benefit Plan, Equity Securities [Member] Other Strategic Investments Other Strategic Investments [Member] Other Strategic Investments Long-term contract liabilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Contract With Customer, Liability, NonCurrent Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Contract With Customer, Liability, NonCurrent Restrictions on cash and cash equivalents Restrictions on Cash and Cash Equivalents [Table Text Block] Investments in unconsolidated affiliates Equity Method Investments Income Statement [Abstract] Income Statement [Abstract] Corporate joint venture Corporate Joint Venture [Member] Entity Registrant Name Entity Registrant Name Total purchase price Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination Net income per share attributable to Fiserv, Inc., Diluted (in dollars per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Trade accounts receivable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 2024 Finance Lease, Liability, to be Paid, Year Three 2025 Finance Lease, Liability, to be Paid, Year Four Subscriber funds Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability Deductions SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Related Party Transaction [Axis] Related Party Transaction [Axis] Forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Income tax provision Tax expense Income tax provision Income Tax Expense (Benefit) Purchases of treasury stock, including employee shares withheld for tax obligations Payments For Repurchase Of Common Stock And Payments Related To Tax Withholding For Share Based Compensation The cash outflow to reacquire common stock during the period and to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. 2024 Defined Benefit Plan, Expected Future Benefit Payment, Year Three Trade accounts receivable, less allowance for doubtful accounts Accounts Receivable, after Allowance for Credit Loss, Current Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Tax Identification Number Entity Tax Identification Number Hedge funds Hedge Funds [Member] Change in fair value of plan assets: Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] Document Fiscal Period Focus Document Fiscal Period Focus Total current assets Assets, Current Total lease payments Lessee, Operating Lease, Liability, to be Paid Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Reclassification adjustment for net realized (gains) losses on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] Computation of shares used in calculating basic and diluted net income per share Schedule of Weighted Average Number of Shares [Table Text Block] Schedule of cash and cash equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Weighted-average estimated fair value per share of stock options granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Equity Component [Domain] Equity Component [Domain] Senior Unsecured Bridge Term Loan Facility Senior Unsecured Bridge Term Loan Facility [Member] Senior Unsecured Bridge Term Loan Facility [Member] 2022 Lessee, Operating Lease, Liability, to be Paid, Year One Income tax benefit on unrealized gain/(loss) on defined benefit plans Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Defined Benefit Plan, Plan Assets, Category [Axis] Defined Benefit Plan, Plan Assets, Category [Axis] 3.850% senior notes due June 2025 3.85% Senior Notes Due 2025 [Member] 3.85% Senior Notes Due 2025 [Member] Fair value of exchanges Consideration transferred, equity value Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Litigation Case [Axis] Litigation Case [Axis] Property and equipment, net Total Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Fair market value adjustment on cash flow hedges, net of income tax (provision) benefit of ($2 million), ($2 million) and $46 million Fair market value adjustment on cash flow hedges, net of income tax benefit Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Total assets acquired Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Assets Acquired Including Goodwill Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Assets Acquired Including Goodwill Shares issued to acquire First Data (in shares) Stock Issued During Period, Shares, Acquisitions Domestic Plan Domestic Plan [Member] Performance obligations expected to be satisfied Revenue, Remaining Performance Obligation, Amount Purchases of investments Payments to Acquire Investments Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Liabilities Liabilities [Abstract] Schedule of allocation of plan assets Schedule of Allocation of Plan Assets [Table Text Block] Valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Counterparty Name [Domain] Counterparty Name [Domain] Retirement of treasury stock (see Note 20) Treasury Stock, Retired, Cost Method, Amount 2025 Lessee, Operating Lease, Liability, to be Paid, Year Four Finance lease and other financing obligations Finance Lease, Liability And Other, Noncurrent Finance Lease, Liability And Other, Noncurrent Income tax expense related to the revaluation of certain net deferred tax liabilities Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability Variable-Rate Revolving Credit Facilities Due March 2023 Variable-Rate Revolving Credit Facilities Due March 2023 [Member] Variable-Rate Revolving Credit Facilities Due March 2023 [Member] Fair Value Measurements Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] Finance lease liabilities Finance Lease, Liability, Current Level 2 Fair Value, Inputs, Level 2 [Member] Accounting Standards Update [Domain] Accounting Standards Update [Domain] Long-term contract liabilities Contract with Customer, Liability, Noncurrent Auditor Location Auditor Location Segment Reporting [Abstract] Segment Reporting [Abstract] Type of Restructuring [Domain] Type of Restructuring [Domain] Useful lives (in years) Finite-Lived Intangible Asset, Useful Life Interest on lease liabilities Finance Lease, Interest Expense Investments in unconsolidated affiliates Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Equity Method Investments Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Equity Method Investments Use of Estimates Use of Estimates, Policy [Policy Text Block] Finance Leases, under ASC 842 Finance Lease, Liability, Payment, Due [Abstract] 3.000% senior notes due July 2031 (British Pound-denominated) 3.0% Senior Notes Due July 2031 [Member] 3.0% Senior Notes Due July 2031 [Member] Title of 12(b) Security Title of 12(b) Security Payments Payments Payments Segment [Member] Payments Segment Total lease liabilities Lease, Liability Lease, Liability Investment, Name [Domain] Investment, Name [Domain] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Document Type Document Type Schedule of components of net investment in sales-type leases Net Investment In Lease [Table Text Block] Net Investment In Lease [Table Text Block] Product and Service [Domain] Product and Service [Domain] Interest rate, stated percentage Debt Instrument, Interest Rate, Stated Percentage New Omaha New Omaha Holdings [Member] New Omaha Holdings Less: net income attributable to noncontrolling interests and redeemable noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Redeemable Noncontrolling Interests Noncontrolling Interest Disclosure [Text Block] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Revolving Credit Facility Revolving credit facility Revolving Credit Facility [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Deferred tax asset valuation allowance SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member] Derivative liability, notional amount Derivative Liability, Notional Amount Schedule of cost, supplemental cash flow and other information related to leases Lease, Cost [Table Text Block] Geographical [Axis] Geographical [Axis] State State and Local Jurisdiction [Member] Cash and cash equivalents included in settlement assets (see Note 6) Cash and cash equivalents Settlement Assets, Current, Cash And Cash Equivalents Settlement Assets, Current, Cash And Cash Equivalents Measurement period adjustment, recognized deferred tax liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Tax Liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Tax Liabilities Product Product revenue Product [Member] Acquisitions and Dispositions Mergers, Acquisitions and Dispositions Disclosures [Text Block] Treasury stock purchases settled after the balance sheet date Treasury Stock Purchases Settled After Balance Sheet Date Future cash outflow to pay for treasury stock purchases that have occurred. Interest Expense Interest Expense [Member] Capitalized contract costs Capitalized Contract Cost, Gross Foreign derived intangibles income deduction Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent Goodwill, expected tax deductible amount Business Acquisition, Goodwill, Expected Tax Deductible Amount Net cash (used in) provided by financing activities from continuing operations Net Cash Provided by (Used in) Financing Activities Treasury stock, at cost, 134 million and 121 million shares Treasury Stock, Value Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted Average Number of Shares Outstanding, Diluted [Abstract] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Vesting period (in years) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Settlement obligations Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Settlement Liabilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Settlement Liabilities Interest expense and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 2.9% senior notes due 2020 2.9% Senior Notes Due 2020 [Member] 2.9% Senior Notes Due 2020 [Member] Net pre-tax gain Income from investments in unconsolidated affiliates Income (Loss) from Equity Method Investments Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax, Excluding Adjustments Other Comprehensive Income (Loss), Net of Tax, Excluding Adjustments Finance lease maturity under Finance Lease, Liability, Fiscal Year Maturity [Table Text Block] Employee termination costs Severance and other separation costs Restructuring Charges Defined Benefit Plan, Expected Future Benefit Payment [Abstract] Defined Benefit Plan, Expected Future Benefit Payment [Abstract] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Fintech Fintech Segment [Member] Fintech Segment [Member] 2024 Finite-Lived Intangible Asset, Expected Amortization, Year Three Processing and services Processing and services revenue Processing And Services [Member] Processing And Services [Member] Foreign Foreign Tax Authority [Member] Acquisitions Business Combinations Policy [Policy Text Block] Debt financing activities Debt costs Debt Related Commitment Fees and Debt Issuance Costs Payables and other liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Retirement of treasury stock (in shares) Treasury Stock, Shares, Retired Conversion or Implementation Costs Conversion Or Implementation Costs [Member] Conversion Or Implementation Costs [Member] Revenue: Revenues [Abstract] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Purchased software Computer Software, Intangible Asset [Member] Document Period End Date Document Period End Date Contingent liability Off-Balance Sheet, Credit Loss, Liability Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Schedule of remaining performance obligations Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Fixed income securities Fixed Income Securities [Member] Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] State income taxes, net of federal effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent State Deferred State and Local Income Tax Expense (Benefit) Schedule of property and equipment Property, Plant and Equipment [Table Text Block] Debt maturities (in days) Debt Instrument, Term Income Statement Location [Domain] Income Statement Location [Domain] Bridge Loan Bridge Loan [Member] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] 0.375% Senior Notes due 2023 Senior Notes Due 2023 [Member] Senior Notes Due 2023 [Member] Schedule of estimated annual amortization expense of intangible assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] 1.625% senior notes due July 2030 (Euro-denominated) 1.625% Senior Notes Due July 2030 [Member] 1.625% Senior Notes Due July 2030 [Member] Card settlements and collateral deposits due to merchants Settlement Liabilities, Current, Card Settlements Due To Merchants Settlement Liabilities, Current, Card Settlements Due To Merchants Shares used in computing net income attributable to Fiserv, Inc. per share: Net income per share attributable to Fiserv, Inc.: Earnings Per Share [Abstract] Equity investments Merchant Alliances Equity Method Investee [Member] Noncontrolling Interest [Table] Noncontrolling Interest [Table] Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss Revaluation/Remeasurement gain Deconsolidation, Revaluation of Retained Investment, Gain (Loss), Amount Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] Amounts reclassified from accumulated other comprehensive loss Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Settlement assets Hosting Arrangement, Service Contract [Abstract] Foreign currency forward exchange contracts Foreign Exchange Contract [Member] Loss contingency accrual Loss Contingency Accrual Sales-Type Leases Sales-type and Direct Financing Leases, Lease Receivable, Fiscal Year Maturity [Abstract] Stock options outstanding - balance at beginning of period (in dollars per share) Stock options outstanding - balance at end of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Expenses: Costs and Expenses [Abstract] Income tax (provision) benefit on fair market value adjustment on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Settlement assets Total settlement assets Settlement Assets, Current Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Entity Current Reporting Status Entity Current Reporting Status Weighted- Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Plan assets investments Fair value of plan assets, beginning balance Fair value of plan assets, ending balance Total investments at fair value Defined Benefit Plan, Plan Assets, Amount Effective income tax rate Effective Income Tax Rate Reconciliation, Percent Estimated range of exposure Loss Contingency, Estimate of Possible Loss Total short-term and current maturities of long-term debt Current debt outstanding Debt, Current General business credit carryforwards General Business Tax Credit Carryforward [Member] Counterparty Name [Axis] Counterparty Name [Axis] Balance at beginning of period (in shares) Balance at end of period (in shares) Shares, Issued Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] U.S. Plan UNITED STATES 2026 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Five Debt Instrument, Option, Two Debt Instrument, Option, Two [Member] Debt Instrument, Option, Two [Member] Accrued taxes Taxes Payable, Current Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table] Net investment in leases Net investment in leases Net Investment in Lease, before Allowance for Credit Loss Leases [Abstract] Leases [Abstract] Income Taxes Income Tax, Policy [Policy Text Block] Buildings and leasehold improvements Buildings and Leasehold Improvements [Member] Buildings and Leasehold Improvements [Member] Intangible Assets Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Schedule of accounts payable and accrued expenses Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Diluted (in shares) Weighted-average common shares outstanding used for the calculation of net income attributable to Fiserv, Inc. per share – diluted Weighted Average Number of Shares Outstanding, Diluted Income Taxes Income Tax Disclosure [Text Block] Leases Lessor, Sales-type Leases [Text Block] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Related Party [Domain] Related Party [Domain] Summary of stock option activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Tax expense Disposal Group, Not Discontinued Operation, Gain On Disposal, Tax Expense Disposal Group, Not Discontinued Operation, Gain On Disposal, Tax Expense License and termination fees License And Termination Fees [Member] License And Termination Fees [Member] Schedule of components of net periodic benefit expense Schedule of Net Benefit Costs [Table Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility [Axis] Credit Facility [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Entity Address, Address Line One Entity Address, Address Line One Interest paid Interest Paid, Including Capitalized Interest, Operating and Investing Activities Retirement Plan Sponsor Location [Domain] Retirement Plan Sponsor Location [Domain] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Hardware, print and card production Hardware, Print, And Card Production [Member] Hardware, Print, And Card Production [Member] Principles of Consolidation Consolidation, Policy [Policy Text Block] Entity Shell Company Entity Shell Company Expected life (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Total current liabilities Liabilities, Current Employee stock purchase plan Employee Stock [Member] SpendLabs and Radius8 SpendLabs, Inc. And Radius8, Inc. [Member] SpendLabs, Inc. And Radius8, Inc. Acceptance Acceptance Segment [Member] Acceptance Segment [Member] Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Loss Contingencies [Table] Loss Contingencies [Table] Proceeds from sale of investments Proceeds from Sale of Equity Securities, FV-NI Current Fiscal Year End Date Current Fiscal Year End Date Unamortized discount and deferred financing costs Unamortized discount and deferred financing costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Banc Of America Merchant Services Joint Venture Banc Of America Merchant Services Joint Venture [Member] Banc Of America Merchant Services Joint Venture Net income Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest First Data First Data [Member] First Data [Member] Employer contribution (as percent) Defined Contribution Plan, Employer Matching Contribution, Percent Of Additional Match Defined Contribution Plan, Employer Matching Contribution, Percent Of Additional Match Statement [Table] Statement [Table] Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Other Deferred Tax Assets, Other 2026 Defined Benefit Plan, Expected Future Benefit Payment, Year Five Measurement period adjustment, increase payables and accrued expenses Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable And Accrued Expenses Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable And Accrued Expenses Unrecognized compensation cost Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Statistical Measurement [Axis] Statistical Measurement [Axis] Cash flow hedges Cash Flow Hedge Derivative Instrument Assets at Fair Value Subsequent Event Subsequent Event [Member] Finance lease liabilities Finance Lease, Liability, Noncurrent Goodwill Goodwill, beginning balance Goodwill, ending balance Goodwill Intangible assets, net Net Book Value Finite-Lived Intangible Assets, Net Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Cash and cash equivalents (1) Defined Benefit Plan, Cash and Cash Equivalents [Member] Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Employee Benefit Plans Pension and Other Postretirement Plans, Pensions, Policy [Policy Text Block] Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share [Member] Merchant portfolios Merchant Portfolios [Member] Merchant Portfolios 1.125% Senior Notes due 2027 Senior Notes Due 2027 [Member] Senior Notes Due 2027 [Member] Schedule of goodwill Schedule of Goodwill [Table Text Block] Scenario [Domain] Scenario [Domain] Adjustments to reconcile net income to net cash provided by operating activities from continuing operations: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Operating lease cost Operating Lease, Cost Related Party Transactions Related Party Transactions Disclosure [Text Block] Off-risk assets Defined Benefit Plan, Off Risk Assets [Member] Defined Benefit Plan, Off Risk Assets [Member] Pension Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Employee contribution (as percent) Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Deferred income taxes Total deferred Deferred Income Tax Expense (Benefit) Discontinued operations cash flow information: Net Cash Provided by (Used in) Discontinued Operations [Abstract] Realized foreign currency transaction gains (losses) Foreign Currency Transaction Gain (Loss), Realized Interest rate subject to increase, maximum (as a percent) Debt Instrument, Interest Rate, Subject To Increase, Maximum Debt Instrument, Interest Rate, Subject To Increase, Maximum Statutory federal income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Net Income Per Share Earnings Per Share, Policy [Policy Text Block] Integration activities charges Business Combination, Integration Related Costs Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Net income attributable to Fiserv, Inc. Net Income (Loss) Attributable to Parent Operating lease assets Operating Lease, Right-of-Use Asset Pre-tax gain on sale Equity Method Investment, Realized Gain (Loss) on Disposal Operating lease payments related to options to extend lease terms that are reasonably certain of being exercised Lessee, Operating Lease, Liability, Option To Extend Lessee, Operating Lease, Liability, Option To Extend Settlement obligations Accounts Payable and Accrued Liabilities [Abstract] Interest cost Interest cost Defined Benefit Plan, Interest Cost Income Statement Location [Axis] Income Statement Location [Axis] Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Statistical Measurement [Domain] Statistical Measurement [Domain] Schedule of annual maturities of total debt Schedule of Maturities of Long-term Debt [Table Text Block] Consideration from sale of business Disposal Group, Including Discontinued Operation, Consideration Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Compensation expense recognized related to discount on purchase date (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Additional paid-in capital Additional Paid in Capital, Common Stock Restructuring Type [Axis] Restructuring Type [Axis] Data processing equipment Data Processing Equipment [Member] Data Processing Equipment [Member] Other long-term assets Other Assets, Noncurrent Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Segments [Axis] Segments [Axis] Expected dividend yield (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Retirement Benefits [Abstract] Retirement Benefits [Abstract] Proceeds from sale of entire ownership interest Proceeds from Sale of Equity Method Investments Entity File Number Entity File Number Schedule of components of lease income Operating Lease, Lease Income [Table Text Block] Share-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Non-cash impairment charge Business Exit Costs Debt Instrument, Option [Domain] Debt Instrument, Option [Domain] [Domain] for Debt Instrument, Option [Axis] Discontinued Operations Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] Contract liabilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Contract With Customer, Liability, Current Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Contract With Customer, Liability, Current 3.500% senior notes due July 2029 3.5% Senior Notes Due July 2029 [Member] 3.5% Senior Notes Due July 2029 [Member] Payments of debt financing, redemption and other costs Payments of Financing Costs Variable lease cost included within operating lease cost Variable Lease, Cost Long-term debt Total long-term debt Long-term Debt and Lease Obligation Foreign currency foreign exchange contracts - Euro and British pound denominated cash Foreign Exchange Contract - Euro And British Pound Denominated Cash [Member] Foreign Exchange Contract - Euro And British Pound Denominated Cash [Member] Operating income of acquiree since acquisition date Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Fair value of restricted stock units vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Actual return on plan assets Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) 0.375% senior notes due July 2023 (Euro-denominated) 0.375% Senior Notes Due July 2023 [Member] 0.375% Senior Notes Due July 2023 [Member] Fiserv Fiserv [Member] Fiserv Property and equipment, gross Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Settlement Assets and Obligations Settlement Assets And Obligations, Policy [Policy Text Block] Disclosure of accounting policy for settlement assets and obligations, including the policy for determination and quantification of balance(s). Credit Facility [Domain] Credit Facility [Domain] Assets Assets [Abstract] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Change in redemption value of redeemable noncontrolling interest (see Note 13) Adjustment to estimated redemption value Noncontrolling Interest, Change in Redemption Value 2024 Long-Term Debt, Maturity, Year Three Accumulated impairment loss Goodwill, Impaired, Accumulated Impairment Loss Land Land [Member] Other Liabilities Other Liabilities [Member] Finance leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Output solutions postage Output Solutions Postage [Member] Output Solutions Postage [Member] Prepaid Expenses Prepaid Expenses [Policy Text Block] Disclosure of accounting policy for prepaid expenses, including the policy for determination and quantification of balance(s). Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Percentage of concentration risk Concentration Risk, Percentage Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] New Accounting Pronouncements or Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Stock options outstanding - balance at beginning of period (in shares) Stock options outstanding - balance at end of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Projected benefit obligations, discount rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Trade names Trade Names [Member] Debt Instrument [Axis] Debt Instrument [Axis] Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Noncurrent: Liabilities, Noncurrent [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Series of Individually Immaterial Business Acquisitions Series of Individually Immaterial Business Acquisitions [Member] Related Party [Axis] Related Party [Axis] Share repurchase amount Stock Repurchased and Retired During Period, Value Receivable securitized loan Secured Debt [Member] 2025 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Four Operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Schedule of pro forma combined financial information Business Acquisition, Pro Forma Information [Table Text Block] Schedule of deferred tax assets and liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Reserve for estimated credit losses on lease payment receivables Net Investment in Lease, Allowance for Credit Loss, Excluding Accrued Interest Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Plan assets target allocation percentage Defined Benefit Plan, Plan Assets, Target Allocation, Percentage Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Revision of Prior Period, Reclassification, Adjustment Revision of Prior Period, Reclassification, Adjustment [Member] Net adjustment to noncontrolling interests from dissolution (see Note 4) Noncontrolling interest decrease Noncontrolling Interest, Decrease from Deconsolidation Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Schedule of funded status of defined benefit pension plans Changes in Projected Benefit Obligations, Fair Value of Plan Assets, and Funded Status of Plan [Table Text Block] Estimated interest expense related to settled interest rate hedge contracts during the next twelve months Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Non-Compete Agreement Non-Compete Agreement [Member] Non-Compete Agreement Contingent consideration Business Combination, Contingent Consideration, Liability, Current Gain on sale of businesses Gain (Loss) on Disposition of Business 2.250% senior notes due July 2025 (British Pound-denominated) 2.25% Senior Notes Due July 2025 [Member] 2.25% Senior Notes Due July 2025 [Member] 2024 Lessee, Operating Lease, Liability, to be Paid, Year Three Settlement activity, net Proceeds From (Payments For) Settlement Activity Proceeds From (Payments For) Settlement Activity Equity Awards Equity Awards [Member] Equity Awards [Member] Non-compete agreements and other Non-Compete Agreements And Other Intangible Assets [Member] Non-Compete Agreements And Other Intangible Assets Nondeductible executive compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Compensation, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Compensation, Percent Thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Five SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] Capitalized software and other intangibles Capitalized Software Development Costs [Member] Internally developed software for sale, licensing or long-term internal use (classified as intangible assets). Net assumed liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Prepaid expenses Prepaid Expense, Current Disaggregation of revenue Disaggregation of Revenue [Table Text Block] 2026 Long-Term Debt, Maturity, Year Five Contributions to defined contribution plans Defined Contribution Plan, Cost Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Settlement of interest rate hedge contracts Unrealized Gain (Loss) on Derivatives Finite-lived intangible assets Gross Carrying Amount Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Fiserv Automotive Solutions, LLC Fiserv Automotive Solutions, LLC [Member] Fiserv Automotive Solutions, LLC [Member] Operating cash flows from operating leases Operating Lease, Payments Net proceeds from (repayments of) commercial paper and short-term borrowings Proceeds from (Repayments of) Short-term Debt Accelerated amortization expense included within finance lease expense Finance Lease, Right-Of-Use Asset, Accelerated Amortization Finance Lease, Right-Of-Use Asset, Accelerated Amortization Total purchase price for acquisition Payments for acquisitions of businesses Total purchase price Business Combination, Consideration Transferred Long-term debt Borrowings with receivables used as collateral Long-term Debt, Gross Goodwill [Roll Forward] Goodwill [Roll Forward] Finance lease assets Finance Lease, Right-of-Use Asset, after Accumulated Amortization Amortization of acquisition-related intangible assets Amortization Of Acquisition-Related Intangible Assets The aggregate expense charged against earnings to allocate the cost of acquired intangible assets. As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method. Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Other operating activities Other Operating Activities, Cash Flow Statement Euro commercial paper notes Euro Unsecured Commercial Paper Notes [Member] Euro Unsecured Commercial Paper Notes Total liabilities and equity Liabilities and Equity Other, net Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Other accrued expenses Other Accrued Liabilities, Current Contract liabilities Contract with Customer, Liability, Current 2026 Lessee, Operating Lease, Liability, to be Paid, Year Five Measurement period adjustment, increase in other long-term liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Long Term Liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Long Term Liabilities Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Income Tax Contingency [Table] Income Tax Contingency [Table] U.S. commercial paper notes U.S. Unsecured Commercial Paper Notes [Member] U.S. Unsecured Commercial Paper Notes Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Purchases of treasury stock Treasury Stock, Value, Acquired, Cost Method Percentage of interest owned in affiliate Equity Method Investment, Ownership Percentage Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] 2023 Defined Benefit Plan, Expected Future Benefit Payment, Year Two Minimum Minimum [Member] Maximum collateral capacity Debt Instrument, Maximum Collateral Capacity Debt Instrument, Maximum Collateral Capacity Finance lease cost Finance Lease, Cost 1 [Abstract] Finance Lease, Cost 1 [Abstract] 2023 Lessee, Operating Lease, Liability, to be Paid, Year Two Amount outstanding Long-term Line of Credit Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Income before income taxes and income from investments in unconsolidated affiliates Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Selling, general and administrative Selling, General and Administrative Expense Debt issuance costs Debt Issuance Costs, Net Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Expected volatility (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Restricted Stock Units and Awards Restricted Stock Units And Restricted Stock Awards [Member] Restricted Stock Units And Restricted Stock Awards Term Loan Facilities Term Loan Facilities [Member] Term Loan Facility [Member] Percentage of business acquired Business Acquisition, Percentage of Voting Interests Acquired Residual values Sales-Type And Direct Financing Leases, Unguaranteed Residual Asset Sales-Type And Direct Financing Leases, Unguaranteed Residual Asset Merchant credit losses Merchant Credit Losses [Member] Merchant Credit Losses [Member] 2025 Long-Term Debt, Maturity, Year Four Other restricted cash Restricted Cash and Cash Equivalents, Noncurrent Share-based compensation costs Share-based Payment Arrangement, Accelerated Cost Payments for acquisitions of businesses, net of cash acquired and including working capital adjustments Payments to Acquire Businesses, Net of Cash Acquired Foreign Currency Translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Schedule of pretax income and income tax provision (benefit) for continuing operations Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Line of Credit Line of Credit [Member] Share-Based Compensation Share-based Payment Arrangement [Text Block] Senior Notes Senior Notes [Member] Level 3 Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] Noncontrolling interests Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Leases, Company as Lessee Lessee, Leases [Policy Text Block] Capitalized Contract Cost [Domain] Capitalized Contract Cost [Domain] Less: Accumulated depreciation Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Number of redeemable noncontrolling interests Number Of Redeemable Noncontrolling Interests Number Of Redeemable Noncontrolling Interests Investments in joint ventures Deferred Tax Liabilities, Investments Net operating loss and credit carry-forwards Deferred Tax Assets, Tax Credit and Operating Loss Carryforwards Deferred Tax Assets, Tax Credit and Operating Loss Carryforwards Net foreign currency gain on financing activities Foreign Currency Transaction Gain (Loss), before Tax Schedule of interest expense, net Interest Income and Interest Expense Disclosure [Table Text Block] Other (expense) income Nonoperating Income (Expense) Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Equity Interest Issued or Issuable, Type [Domain] Equity Interest Issued or Issuable, Type [Domain] Performance Share Units Performance Shares [Member] Commitments and Contingencies (see Note 19) Commitments and Contingencies Amortization of financing costs, debt discounts and other Amortization Of Debt Issuance Costs, Discounts And Other Amortization Of Debt Issuance Costs, Discounts And Other Schedule of redeemable noncontrolling interests activity Redeemable Noncontrolling Interest [Table Text Block] Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Emerging Growth Company Entity Emerging Growth Company 2.750% senior notes due July 2024 2.75% Senior Notes Due July 2024 [Member] 2.75% Senior Notes Due July 2024 [Member] Foreign currency translation Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) Disposal Group Classification [Axis] Disposal Group Classification [Axis] Foreign lines of credit Foreign Line of Credit [Member] Accounting Standards Update 2016-13 Accounting Standards Update 2016-13 [Member] Unrealized gains (losses) on defined benefit pension plans, net of income tax (provision) benefit of ($17 million), $2 million and $1 million Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax Auditor Name Auditor Name Cover [Abstract] Cover [Abstract] Amounts due from unconsolidated merchant alliances Due from Related Parties, Current Total expenses Costs and Expenses Other comprehensive income (loss) before reclassifications Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Short-term and current maturities of long-term debt Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Debt, Current Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Debt, Current Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Treasury stock, shares (in shares) Treasury Stock, Shares Total long-term debt Debt, Long-term and Short-term, Combined Amount Bank Of America Bank Of America [Member] Bank Of America [Member] Less: Interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Sales-Type Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Sales-Type Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] Controlling interest sold (as a percent) Sale of Business, Percentage Of Ownership Sold In Transaction Sale of Business, Percentage Of Ownership Sold In Transaction Number of shares issued for acquisition (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Less: Interest Finance Lease, Liability, Undiscounted Excess Amount Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Previously held non-controlling interest Less: Fair value of previously held equity interest Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value Document Information [Table] Document Information [Table] Carrying value Reported Value Measurement [Member] Cash payments Payments for Restructuring Total purchase price Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest 2026 Finance Lease, Liability, to be Paid, Year Five Interest income Investment Income, Interest Common Stock, par value $0.01 per share Common Stock Common Stock [Member] Balance sheet classification of lease assets and liabilities Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Operating income Operating income (loss) Operating Income (Loss) Operating lease liabilities Operating Lease, Liability, Current Less: other comprehensive (loss) income attributable to noncontrolling interests Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest 2023 Finite-Lived Intangible Asset, Expected Amortization, Year Two Schedule of Cash and Cash Equivalents [Table] Schedule of Cash and Cash Equivalents [Table] Share-based compensation Share-based Payment Arrangement, Noncash Expense Cash and cash equivalents Cash and cash equivalents on the consolidated balance sheets Cash and Cash Equivalents, at Carrying Value Depreciation expense Depreciation Net cash flows from discontinued operations Net Cash Provided by (Used in) Discontinued Operations Acquired software and technology Acquired software and technology Technology-Based Intangible Assets [Member] Treasury Shares Treasury Stock Treasury Stock [Member] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Non-cash impairment charges Asset Impairment Charges Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Notional amount of derivatives Derivative, Notional Amount Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid 4.750% senior notes due June 2021 4.75% Senior Notes Due 2021 [Member] 4.75% Senior Notes Due 2021 [Member] Foreign currency translation Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) Capital expenditures, including capitalized software and other intangibles Capital expenditures, including capitalized software and other intangibles Payments to Acquire Property, Plant, and Equipment defi SOLUTIONS defi SOLUTIONS Group [Member] defi SOLUTIONS Group Company contribution Defined Benefit Plan, Plan Assets, Contributions by Employer Weighted average interest rate percentage Line of Credit Facility, Interest Rate at Period End Total liabilities Liabilities Share of income Temporary Equity, Net Income 2022 Finite-Lived Intangible Asset, Expected Amortization, Year One Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Stock options outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Right-of-use assets obtained in exchange for lease liabilities: Right-Of-Use Asset Obtained In Exchange For Lease Liability [Abstract] Right-Of-Use Asset Obtained In Exchange For Lease Liability [Abstract] Fintech Financial Institution Services Segment [Member] Financial Institution Services Segment Consolidation Items [Axis] Consolidation Items [Axis] Leases Lessor, Operating Leases [Text Block] Net operating loss carryforwards Operating Loss Carryforwards Common stock, shares issued (in shares) Common Stock, Shares, Issued Preferred stock, issued (in shares) Preferred Stock, Shares Issued Net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] Interest expense, net Interest Revenue (Expense), Net Schedule of weighted-average rate assumptions Defined Benefit Plan, Assumptions [Table Text Block] Entity Address, City or Town Entity Address, City or Town Foreign currency translation adjustment Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), After Reclassification And Tax Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), After Reclassification And Tax Schedule of expected future benefit payments Schedule of Expected Benefit Payments [Table Text Block] Changes in accumulated other comprehensive loss by component, net of income taxes Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Finance lease and other financing obligations Finance Lease, Liability And Other, Current Finance Lease, Liability And Other, Current Balance Sheet Location [Axis] Balance Sheet Location [Axis] Accumulated Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Variable-Rate Term Loan Facilities Due March 2023 Variable-Rate Term Loan Facilities Due March 2023 [Member] Variable-Rate Term Loan Facilities Due March 2023 [Member] Residual Buyout Intangible Assets Residual Buyout Intangible Assets [Member] Residual Buyout Intangible Assets Measurement Frequency [Domain] Measurement Frequency [Domain] Interest expense Interest Expense 2022 Finance Lease, Liability, to be Paid, Year One Increases for assumed tax positions related to First Data Unrecognized Tax Benefits, Increase Resulting from Acquisition Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Net periodic benefit expense, expected long-term return on plan assets Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Net assets acquired Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Capitalized contract costs, amortization Capitalized Contract Cost, Amortization 2022 Defined Benefit Plan, Expected Future Benefit Payment, Year One Retained earnings Retained Earnings (Accumulated Deficit) Litigation Case [Domain] Litigation Case [Domain] Period that awards will expire (in years) Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Entity Filer Category Entity Filer Category Average risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Fair Value Estimate of Fair Value Measurement [Member] 1.125% senior notes due July 2027 (Euro-denominated) 1.125% Senior Notes Due July 2027 [Member] 1.125% Senior Notes Due July 2027 [Member] Recent Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Cash received from stock options exercised Proceeds from Stock Options Exercised 2023 Finance Lease, Liability, to be Paid, Year Two Total equity Balance at beginning of period Balance at end of period Stockholders' equity, including portion attributable to noncontrolling interest Prior period reclassification adjustment Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of operating loss carryforwards and general business credit carryforwards Summary of Tax Credit Carryforwards [Table Text Block] Amendment Flag Amendment Flag Debt proceeds Proceeds from Issuance of Long-term Debt Equity Components [Axis] Equity Components [Axis] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Fiserv LS LLC Fiserv LS LLC [Member] Fiserv LS LLC [Member] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Weighted-average remaining lease term: Weighted Average Remaining Lease Term [Abstract] Weighted Average Remaining Lease Term [Abstract] Schedule of segment reporting information Schedule of Segment Reporting Information, by Segment [Table Text Block] Equity Method Investment, Nonconsolidated Investee [Domain] Equity Method Investment, Nonconsolidated Investee [Domain] Federal Deferred Federal Income Tax Expense (Benefit) Equity Method Investments and Joint Ventures [Abstract] Equity Method Investments and Joint Ventures [Abstract] Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Contingent consideration Business Combination, Contingent Consideration, Liability, Noncurrent Settlement Assets and Obligations Settlement Assets And Obligations [Text Block] Settlement Assets And Obligations [Text Block] Product and Service [Axis] Product and Service [Axis] Equity securities without readily determinable fair value Equity Securities without Readily Determinable Fair Value, Amount Audit Information [Abstract] Audit Information Entity Public Float Entity Public Float Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Treasury Lock Treasury Lock [Member] Distribution of nonmonetary assets (see Note 4) Distribution Of Nonmonetary Assets Distribution Of Nonmonetary Assets Summary of restricted stock and performance activity Schedule Of Share-Based Compensation, Restricted Stock Units, Restricted Stock Awards, Performance Share Units And Performance Share Awards Activity [Table Text Block] Schedule Of Share-Based Compensation, Restricted Stock Units, Restricted Stock Awards, Performance Share Units And Performance Share Awards Activity [Table Text Block] Acquired software and technology Acquired Software And Technology [Member] Purchased software applications and internally developed software for sale, licensing or long-term internal use acquired in a business combination. Shares issued under stock plans (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Discontinued Operations, Disposed of by Sale Discontinued Operations, Disposed of by Sale [Member] Foreign currency translation, net of income tax (see Note 14) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Shares issued under equity plan (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Other investments Defined Benefit Plan, Other Investments [Member] Defined Benefit Plan, Other Investments [Member] Statement [Line Items] Statement [Line Items] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Contract liabilities Increase (Decrease) in Contract with Customer, Liability Payment for legal settlement Litigation Settlement, Amount Awarded to Other Party Accrued expenses Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals Weighted- Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] 2023 Sales-Type and Direct Financing Leases, Lease Receivable, to be Received, Year Two Shares issued under stock plans Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Federal Domestic Tax Authority [Member] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table] Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table] Tax Period [Axis] Tax Period [Axis] Contingent debt guarantee Guarantees, Fair Value Disclosure Allowance for Doubtful Accounts Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block] Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Valuation allowance Valuation allowance Deferred Tax Assets, Valuation Allowance Minimum lease payments Total minimum lease payments Sales-type and Direct Financing Leases, Lease Receivable, Payments to be Received Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Processing and other support services agreement, term (in years) Deconsolidation, Period of Continuing Involvement After Deconsolidation Deconsolidation, Period of Continuing Involvement After Deconsolidation Employee Benefit Plans Retirement Benefits [Text Block] Software maintenance Software Maintenance [Member] Software Maintenance [Member] Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Document Annual Report Document Annual Report Forecast Forecast [Member] Disposal Group, Disposed of by Sale, Not Discontinued Operations Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Total assets Assets Geographical [Domain] Geographical [Domain] Sale of businesses and subsidiary restructuring Effective Income Tax Rate Reconciliation, Disposition of Business, Percent Noncontrolling Interests Noncontrolling Interest [Member] Derivative Contract [Domain] Derivative Contract [Domain] Measurement period adjustments related to First Data acquisition (see Note 4) Noncontrolling Interest, Increase (Decrease) From Business Combination, Measurement Period Adjustments Noncontrolling Interest, Increase (Decrease) From Business Combination, Measurement Period Adjustments Distributions paid to redeemable noncontrolling interests Distributions paid to redeemable noncontrolling interests Noncontrolling Interest, Decrease From Distributions To Redeemable Noncontrolling Interest Holders Noncontrolling Interest, Decrease From Distributions To Redeemable Noncontrolling Interest Holders Debt Instrument, Option [Axis] Debt Instrument, Option [Axis] Debt Instrument, Option [Axis] 4.400% senior notes due July 2049 4.4% Senior Notes Due July 2049 [Member] 4.4% Senior Notes Due July 2049 [Member] Accounts Payable and Accrued Liabilities Accounts Payable and Accrued Liabilities [Member] Performance obligations expected to be satisfied, expected timing Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] All Currencies [Domain] All Currencies [Domain] Net cash provided by operating activities from continuing operations Net Cash Provided by (Used in) Operating Activities General business credit carryforwards Tax Credit Carryforward, Amount Schedule of debt, net of discounts and debt issuance costs Schedule of Debt [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Cash and Cash Equivalents [Line Items] Cash and Cash Equivalents [Line Items] Capitalized Contract Cost [Axis] Capitalized Contract Cost [Axis] Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Basic (in shares) Weighted-average common shares outstanding used for the calculation of net income attributable to Fiserv, Inc. per share – basic Weighted Average Number of Shares Outstanding, Basic Net income attributable to Fiserv, Inc. per share – diluted (in dollars per share) Earnings Per Share, Diluted Segments [Domain] Segments [Domain] Common stock equivalents (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Net income attributable to redeemable noncontrolling interests Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Product revenue Sales [Member] Income taxes paid Income Taxes Paid, Net Settlement Assets Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Settlement Assets Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Settlement Assets Investment Services Business Investment Services Business [Member] Investment Services Business [Member] Accounting Standards Update [Extensible Enumeration] Accounting Standards Update [Extensible Enumeration] Non-US Non-US [Member] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Schedule of amortization expense of intangible assets Finite-lived Intangible Assets Amortization Expense [Table Text Block] Distributions paid to noncontrolling interests and redeemable noncontrolling interests Payments of Ordinary Dividends, Noncontrolling Interest Comprehensive income attributable to Fiserv, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Employee Termination Costs Employee Severance [Member] Contract liabilities Contract with Customer, Liability Financial Guarantee Financial Guarantee [Member] MerchantPro, Bypass, and Inlet MerchantPro Express LLC, Bypass Mobile, LLC, And Inlet LLC [Member] MerchantPro Express LLC, Bypass Mobile, LLC, And Inlet LLC Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Deferred income taxes Noncurrent liabilities Deferred Income Tax Liabilities, Net Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Property and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Reconciliation of statutory federal income tax rate to effective income tax rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Trade accounts payable Accounts Payable, Current Depreciation and amortization expense Depreciation, Depletion and Amortization Measurement period adjustment, intangible assets Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles Schedule of assets and liabilities measured at fair value on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Accumulated Other Comprehensive Loss Total AOCI Attributable to Parent [Member] Leasing liabilities Deferred Tax Assets, Leasing Liabilities Deferred Tax Assets, Leasing Liabilities Contract assets Contract with Customer, Asset, after Allowance for Credit Loss Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Cost of goods and services sold Cost of Goods and Services Sold Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Proceeds from sale of businesses Proceeds from Divestiture of Businesses Entity Central Index Key Entity Central Index Key On-risk assets Defined Benefit Plan, On Risk Assets [Member] Defined Benefit Plan, On Risk Assets [Member] Other Product and Service, Other [Member] Merchant Alliances Merchant Alliances [Member] Merchant Alliances [Member] 3.500% senior notes due October 2022 3.5% Senior Notes Due 2022 [Member] 3.5% Senior Notes Due 2022 [Member] Settlements Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement Total lease cost Lease, Cost Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Decreases for tax positions taken in prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Sales-type leases: Lessor, Lease, Description [Line Items] Debt Financing Activities Debt Financing Activities [Member] Debt Financing Activities [Member] Allowance for Merchant Credit Losses Loss Contingencies, Policy [Policy Text Block] Loss Contingencies, Policy [Policy Text Block] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Long-term debt and other long-term liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Other long-term liabilities Other Liabilities, Noncurrent Foreign currency foreign exchange contracts - Euro and British pound denominated senior notes Foreign Exchange Contract - Euro And British Pound Denominated Senior Notes [Member] Foreign Exchange Contract - Euro And British Pound Denominated Senior Notes [Member] Plan benefit obligations, beginning balance Plan benefit obligations, ending balance Defined Benefit Plan, Benefit Obligation NetPay NetPay Solutions Group [Member] NetPay Solutions Group Purchases of treasury stock (in shares) Treasury Stock, Shares, Acquired Debt Instrument [Line Items] Debt Instrument [Line Items] Processing Processing [Member] Processing [Member] Trading Symbol Trading Symbol Customer relationships, net Customer relationships Customer-Related Intangible Assets [Member] Total revenue Business Acquisition, Pro Forma Revenue Related Party Transaction [Domain] Related Party Transaction [Domain] Other Deferred Tax Liabilities, Other Unrecognized tax benefits Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Acceptance First Data Segment [Member] First Data Segment [Member] Leases, Company as Lessor Lessor, Leases [Policy Text Block] Total principal payments Debt and Lease Obligation Collateral held Loss Contingency, Collateral Held Loss Contingency, Collateral Held Schedule of Goodwill [Table] Schedule of Goodwill [Table] Share-based compensation expense Share-based Payment Arrangement, Expense Earn-out provisions estimated fair value Business Combination, Consideration Transferred, Liabilities Incurred Cost of Processing, Services, and Product Cost of Goods and Service [Policy Text Block] Excess tax benefit from share-based awards Effective Income Tax Reconciliation, Share-based Compensation, Excess Tax Benefit, Percent Effective Income Tax Reconciliation, Share-based Compensation, Excess Tax Benefit, Percent Stock options exercisable (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Settlements Defined Benefit Plan, Plan Assets, Payment for Settlement Ownership percentage by noncontrolling owner Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Residual buyouts Residual Buyouts [Member] Residual Buyouts 1.625% Senior Notes due 2030 Senior Notes Due 2030 [Member] Senior Notes Due 2030 [Member] Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Lending Solutions Business And Investment Services Business Lending Solutions Business And Investment Services Business [Member] Lending Solutions Business And Investment Services Business [Member] Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Secondary public offering (in shares) Sale of Stock, Number of Shares Issued in Transaction Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Other financing activities Proceeds from (Payments for) Other Financing Activities Gross Carrying Amount Finite-Lived Intangible Assets, Gross Schedule of intangible assets by class Schedule of Finite-Lived Intangible Assets [Table Text Block] Asset Impairment Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Equity Interest Type [Axis] Equity Interest Type [Axis] Share-based awards, stock options, exercised (in shares) Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Settlement obligations Total settlement obligations Settlement Liabilities, Current InvestCloud Holdings, LLC InvestCloud Holdings, LLC [Member] InvestCloud Holdings, LLC Total other comprehensive loss Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax Fair Value, Recurring Fair Value, Recurring [Member] Redeemable noncontrolling interests Business Combination, Acquisition Of Less Than 100 Percent, Redeemable Noncontrolling Interest, Fair Value Business Combination, Acquisition Of Less Than 100 Percent, Redeemable Noncontrolling Interest, Fair Value Liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] Award requisite performance period (in years) Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Accrued interest Interest Payable, Current Entity shares issued per acquiree share (in shares) Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Entity Shares Issued Per Acquiree Share Business Combination, Consideration Transferred, Equity Interests Issued And Issuable, Entity Shares Issued Per Acquiree Share Pineapple Payments Pineapple Payments Holdings, LLC [Member] Pineapple Payments Holdings, LLC Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Lapse of the statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Cash Flow Hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Measurement Basis [Axis] Measurement Basis [Axis] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Five Cash paid for amounts included in the measurement of lease liabilities: Cash Flow, Lessee [Abstract] Cash Flow, Lessee [Abstract] Capitalized sales commissions and conversion or implementation costs Capitalized Contract Cost [Table Text Block] Auditor Firm ID Auditor Firm ID Capital contribution Payments to Acquire Equity Method Investments Lending Solutions Business Lending Solutions Business [Member] Lending Solutions Business [Member] Net cash used in investing activities from continuing operations Net Cash Provided by (Used in) Investing Activities Change in projected benefit obligations: Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Changes in assets and liabilities, net of effects from acquisitions and dispositions: Increase (Decrease) in Operating Capital [Abstract] Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Class of Stock [Domain] Class of Stock [Domain] Cash purchase price Payments to Acquire Businesses, Gross Lending Joint Ventures Lending Joint Ventures [Member] Lending Joint Ventures Schedule of maturities of future minimum lease payments Sales-type and Direct Financing Leases, Lease Receivable, Maturity [Table Text Block] Professional services Professional Services [Member] Professional Services [Member] Income tax provision (benefit) on reclassification adjustment for net realized gain on cash flow hedges Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax Operating cash flows from finance leases Finance Lease, Interest Payment on Liability Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Foreign currency translation Goodwill, Foreign Currency Translation Gain (Loss) 3.000% Senior Notes due 2031 Senior Notes Due 2031 [Member] Senior Notes Due 2031 [Member] Schedule of values and weighted-average useful life allocated to intangible assets Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Ownership [Domain] Ownership [Domain] Banc of America Merchant Services Merchant Alliances Banc of America Merchant Services [Member] Banc of America Merchant Services [Member] Net periodic benefit expense, discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Debt Instrument, Option, One Debt Instrument, Option, One [Member] Debt Instrument, Option, One [Member] Less: Unearned interest income Sales-Type And Direct Financing Leases, Unearned Interest Income Sales-Type And Direct Financing Leases, Unearned Interest Income Finance leases, remaining lease term (in months and years) Lessee, Finance Lease, Remaining Lease Term Aggregate Intrinsic Value (In millions) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Aggregate Intrinsic Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Aggregate Intrinsic Value Restructuring and Other Charges Restructuring, Impairment, and Other Activities Disclosure [Text Block] Cash and cash equivalents, beginning balance Cash and cash equivalents, ending balance Total cash and cash equivalents on the consolidated statements of cash flows Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Cost of Processing and Services Cost Of Services [Member] Cost Of Services [Member] Additional consideration due from the Company Deconsolidation, Additional Consideration, Gain (Loss), Amount Deconsolidation, Additional Consideration, Gain (Loss), Amount Term loan facility Term Loan Facility [Member] Term Loan Facility [Member] Balance at Beginning of Period Balance at End of Period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Cost of product Cost of Sales [Member] Accounts payable and accrued expenses Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accounts Payable And Accrued Expenses Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accounts Payable And Accrued Expenses 4.200% senior notes due October 2028 4.2% Senior Notes Due 2028 [Member] 4.2% Senior Notes Due 2028 [Member] Foreign Current Foreign Tax Expense (Benefit) Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Income tax benefit from stock options exercised and restricted stock units vested Employee Service Share-based Compensation Tax Benefit Realized From Exercise Of Stock Options And Vesting Of Restricted Stock Units Employee Service Share-based Compensation Tax Benefit Realized From Exercise Of Stock Options And Vesting Of Restricted Stock Units Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Debt Long-term Debt [Text Block] Revenues