Corporate and Other Corporate Reconciling Items And Eliminations [Member] Corporate Reconciling Items And Eliminations [Member] Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Net income attributable to Fiserv, Inc. 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Contract Liability, and Receivable [Table Text Block] Additional paid-in capital Additional Paid in Capital, Common Stock 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] Other long-term assets Other Assets, Noncurrent 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] Segments [Axis] Segments [Axis] 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] Entity File Number Entity File Number Share-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition First Data Joint Venture First Data Joint Venture [Member] First Data Joint Venture [Member] Increase in goodwill Goodwill, Purchase Accounting Adjustments Gain on sale of assets Gain on sale of assets Gain (Loss) on Disposition of Assets Subsequent Event Type [Domain] Subsequent Event Type [Domain] 3.500% senior notes due July 2029 3.5% Senior Notes Due July 2029 [Member] 3.5% Senior Notes Due July 2029 [Member] Amortization expense Amortization of Intangible Assets Weighted-Average Useful Life (in years) Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Proceeds from issuance of treasury stock Proceeds from Issuance or Sale of Equity Long-term debt Total long-term debt Long-term Debt and Lease Obligation Stock options excluded from the calculation of diluted weighted-average outstanding shares because their impact was anti-dilutive (in shares) 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 Business Combination and Asset Acquisition [Abstract] 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 Business Acquisition [Axis] Business Acquisition [Axis] Aggregate merchant credit loss expense Loss Contingency, Loss in Period 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] 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] Settlement Assets and Obligations Settlement Assets And Obligations, Policy [Policy Text Block] Settlement Assets And Obligations, Policy Local Phone Number Local Phone Number Carrying value of non-contingent liability Guarantor Obligations, Current Carrying Value Credit Facility [Domain] Credit Facility [Domain] Assets Assets [Abstract] Related Party Transactions [Abstract] Related Party Transactions [Abstract] 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 Investments in and Advances to Affiliates [Table] Investments in and Advances to Affiliates [Table] Accumulated impairment loss Goodwill, Impaired, Accumulated Impairment Loss Right-of-use assets obtained in exchange for lease liabilities - finance leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Output solutions postage Output Solutions Postage [Member] Output Solutions Postage [Member] Decrease in unrecognized tax benefits reasonably possible Decrease in Unrecognized Tax Benefits is Reasonably Possible 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 Preferred stock, no par value: 25 million shares authorized; none issued Preferred Stock, Value, Issued 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 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Increase (Decrease) in Accounts Receivable Pre-tax gain Deconsolidation, Gain (Loss), Amount Right-of-use assets obtained in exchange for lease liabilities - operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Weighted average interest rate Debt, Weighted Average Interest Rate Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] 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 Contingent consideration Business Combination, Contingent Consideration, Liability, Current Net income attributable to Fiserv, Inc. per share – basic (in dollars per share) Earnings Per Share, Basic 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] Revenue Recognition Revenue from Contract with Customer [Text Block] Settlement activity, net Proceeds From (Payments For) Settlement Activity Proceeds From (Payments For) Settlement Activity Document Information [Line Items] Document Information [Line Items] Non-compete agreements and other Non-Compete Agreements And Other Intangible Assets [Member] Non-Compete Agreements And Other Intangible Assets Acquired cash Cash Acquired from Acquisition 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 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). 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As a noncash expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method. 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 Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Other operating activities Other Operating Activities, Cash Flow Statement Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Entity Small Business Entity Small Business Euro commercial paper notes Euro Unsecured Commercial Paper Notes [Member] Euro Unsecured Commercial Paper Notes Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Total liabilities and equity Liabilities and Equity Other accrued expenses Other Accrued Liabilities, Current Contract liabilities Contract with Customer, Liability, Current Scenario [Axis] Scenario [Axis] Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Liabilities and Equity Liabilities and Equity [Abstract] Accounts payable and accrued expenses Total Accounts Payable and Accrued Liabilities, Current Software obtained under financing arrangements Financed Software Arrangements Financed Software Arrangements 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] Shares Used in Computing Net Income Per Share Attributable to Fiserv, Inc. Earnings Per Share [Text Block] Purchases of treasury stock Treasury Stock, Value, Acquired, Cost Method Debt repayments Repayment of Long-term Debt, Long-term Lease Obligation, and Capital Security Percentage of interest owned in affiliate Equity Method Investment, Ownership Percentage Entity Interactive Data Current Entity Interactive Data Current Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Interest Expense, Net Interest Expense, Policy [Policy Text Block] Minimum Minimum [Member] Affiliated entities Affiliated Entity [Member] Noncontrolling Interest [Abstract] Noncontrolling Interest [Abstract] Outstanding borrowings 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 Balance Sheet Location [Domain] Balance Sheet Location [Domain] 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 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 Unrecognized tax benefits Unrecognized Tax Benefits Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Estimate of gains 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 Restricted Stock Units and Awards Restricted Stock Units And Restricted Stock Awards [Member] Restricted Stock Units And Restricted Stock Awards Term loan facility Term Loan Facilities [Member] Term Loan Facility [Member] Accrued compensation and benefits Accrued Employee Benefits, Current Merchant credit losses Merchant Credit Losses [Member] Merchant Credit Losses [Member] Other restricted cash Restricted Cash and Cash Equivalents, Noncurrent Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Payments for acquisition of businesses, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Foreign Currency Translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Schedule of income tax provision and effective income tax rate Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Stock options exercisable (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price 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 [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Distribution of nonmonetary assets (see Note 10) Noncash or Part Noncash Divestiture, Amount of Consideration Received 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] Number of redeemable noncontrolling interests Number Of Redeemable Noncontrolling Interests Number Of Redeemable Noncontrolling Interests Other net assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Redeemable Noncontrolling Interests Balance at beginning of period Balance at end of period Redeemable Noncontrolling Interest, Equity, Carrying Amount Document Transition Report Document Transition Report Schedule of interest expense, net Interest Income and Interest Expense Disclosure [Table Text Block] Common stock, $0.01 par value: 1,800 million shares authorized; 784 million shares issued Common Stock, Value, Issued Other (expense) income Nonoperating Income (Expense) Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Weighted-average period unrecognized compensation cost will be recognized (in years) 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 Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Performance Share Units Performance Shares [Member] Commitments and Contingencies (see Note 17) Commitments and Contingencies Amortization of financing costs and debt discounts 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 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] Ownership [Axis] Ownership [Axis] Foreign lines of credit Foreign Line of Credit [Member] Unrealized (loss) gain on defined benefit pension plans, net of income tax benefit (provision) of $0 million and ($0 million) Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax 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 Class of Stock [Axis] Class of Stock [Axis] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Treasury stock (in shares) Treasury Stock, Shares Interest expense, net Interest Income (Expense), Net 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] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Ondot Ondot Systems, Inc. [Member] Ondot Systems, Inc. Processing, administrative, and other fees Revenue from Related Parties Revenue Revenue from Contract with Customer, Excluding Assessed Tax Stock options Share-based Payment Arrangement, Option [Member] 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] Equity [Abstract] Equity [Abstract] Carrying value Reported Value Measurement [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Document Quarterly Report Document Quarterly Report Interest income Investment Income, Interest Common Stock, par value $0.01 per share Common Shares Common Stock [Member] Business Segment Information Segment Reporting Disclosure [Text Block] Derecognition of redeemable noncontrolling interest Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Operating income Operating income (loss) Operating Income (Loss) Plus: other comprehensive loss attributable to noncontrolling interests Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Document Fiscal Year Focus Document Fiscal Year Focus Share-based compensation Share-based Payment Arrangement, Noncash Expense Additional Paid-In Capital Additional Paid-in Capital [Member] BentoBox CMS, Inc. BentoBox CMS, Inc. [Member] BentoBox CMS, Inc. Acquired software and technology Technology-Based Intangible Assets [Member] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] 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 Notional amount of derivatives Derivative, Notional Amount Other (expense) income Other Nonoperating Income (Expense) Capital expenditures, including capitalized software and other intangibles Payments to Acquire Property, Plant, and Equipment defi SOLUTIONS Group defi SOLUTIONS Group [Member] defi SOLUTIONS Group 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] Total liabilities Liabilities Share of income Temporary Equity, Net Income Award Type [Axis] Award Type [Axis] Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Stock options outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 2.250% senior notes due June 2027 2.25% Senior Notes Due 2027 [Member] 2.25% Senior Notes Due 2027 [Member] Consolidation Items [Axis] Consolidation Items [Axis] Total Fiserv, Inc. shareholders’ equity Stockholders' Equity Attributable to Parent Common stock, shares issued (in shares) Common Stock, Shares, Issued Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued 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 Schedule of supplemental cash flow information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Interest expense, net Interest Revenue (Expense), Net Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] 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 Intangible Assets Intangible Assets Disclosure [Text Block] Fiserv, Inc. Shareholders’ Equity: Stockholders' Equity Attributable to Parent [Abstract] Changes in accumulated other comprehensive loss by component, net of income taxes Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] 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 buyouts Residual Buyout Intangible Assets [Member] Residual Buyout Intangible Assets Measurement Frequency [Domain] Measurement Frequency [Domain] Interest expense Interest Expense 2.650% senior notes due June 2030 2.65% Senior Notes Due 2030 [Member] 2.65% Senior Notes Due 2030 [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Total consideration Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Investments in and Advances to Affiliates [Line Items] Investments in and Advances to Affiliates [Line Items] Retained earnings Retained Earnings (Accumulated Deficit) Operating segments Operating Segments [Member] Litigation Case [Domain] Litigation Case [Domain] Schedule of purchase price allocation Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Entity Filer Category Entity Filer Category 2.250% Senior Notes due 2025 Senior Notes Due 2025 [Member] Senior Notes Due 2025 [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] 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] Fair value Estimate of Fair Value Measurement [Member] Entity Registrant Name Entity Registrant Name 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] Total purchase price Business Combination, Consideration Transferred, Including Equity Interest in Acquiree Held Prior to Combination Receivables and other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Recent Accounting Pronouncements Accounting Standards Update and Change in Accounting Principle [Text Block] Subscriber funds Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability Basis of Presentation and 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 Total equity Balance at beginning of period Balance at end of period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] 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. Trade accounts receivable, less allowance for doubtful accounts Accounts Receivable, after Allowance for Credit Loss, Current Amendment Flag Amendment Flag Debt proceeds Proceeds from Issuance of Long-term Debt Equity Components [Axis] Equity Components [Axis] Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Entity Tax Identification Number Entity Tax Identification Number Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Total current assets Assets, Current Concentration Risk Type [Domain] Concentration Risk Type [Domain] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] 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 Schedule of segment reporting information Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Schedule of stockholders equity Schedule of Stockholders Equity [Table Text Block] Finxact, Inc. Finxact, Inc. [Member] Finxact, Inc. Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Contingent consideration Business Combination, Contingent Consideration, Liability, Noncurrent Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Product and Service [Axis] Product and Service [Axis] Computation of shares used in calculating basic and diluted net income per common 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] Equity securities without a readily determinable fair value Equity Securities without Readily Determinable Fair Value, Amount Treasury Lock Treasury Lock [Member] 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] Equity Component [Domain] Equity Component [Domain] Shares issued under stock plans (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture 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. Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Foreign currency translation, net of income tax (see Note 12) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Income tax provision on unrealized gain on defined benefit plans Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax 3.850% senior notes due June 2025 3.85% Senior Notes Due 2025 [Member] 3.85% Senior Notes Due 2025 [Member] Statement [Line Items] Statement [Line Items] Litigation Case [Axis] Litigation Case [Axis] Fair market value adjustment on cash flow hedges, net of income tax benefit (provision) of $0 million and ($0 million) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Proceeds from sale of assets Proceeds from Sales of Assets, Investing Activities Contract liabilities Increase (Decrease) in Contract with Customer, Liability Weighted-Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Performance obligations expected to be satisfied Revenue, Remaining Performance Obligation, Amount Purchases of investments Payments to Acquire Investments Shares issued under stock plans Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Finance lease and other financing obligations Finance Lease, Liability And Other, Noncurrent Finance Lease, Liability And Other, Noncurrent Debt Disclosure [Abstract] Debt Disclosure [Abstract] 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] Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table] Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table] 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] Level 2 Fair Value, Inputs, Level 2 [Member] Long-term contract liabilities Contract with Customer, Liability, Noncurrent Segment Reporting [Abstract] Segment Reporting [Abstract] Software maintenance Software Maintenance [Member] Software Maintenance [Member] Use of Estimates Use of Estimates, Policy [Policy Text Block] 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] Forecast Forecast [Member] 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 Segment [Member] Payments Segment Total assets Assets Investment, Name [Domain] Investment, Name [Domain] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations Geographical [Domain] Geographical [Domain] Document Type Document Type Noncontrolling Interests Noncontrolling Interest [Member] Product and Service [Domain] Product and Service [Domain] Interest rate, stated percentage Debt instrument, interest rate Debt Instrument, Interest Rate, Stated Percentage Derivative Contract [Domain] Derivative Contract [Domain] Less: net income attributable to noncontrolling interests and redeemable noncontrolling interests Less: net income attributable to noncontrolling 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