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Acquisitions and Dispositions - Narrative (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Feb. 18, 2020 | Jul. 29, 2019 | Oct. 31, 2018 | Mar. 29, 2018 | Aug. 31, 2019 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Jul. 29, 2020 | Jul. 29, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue of acquiree since acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,000,000
Operating income of acquiree since acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000
Goodwill |  |  |  |  |  | $ 36,322,000,000 |  |  |  | $ 36,038,000,000 |  |  |  | $ 36,322,000,000 |  |  | $ 36,038,000,000 | 5,702,000,000
Tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 196,000,000 |  |  | 198,000,000 | 378,000,000
Reduction to additional paid-in capital |  |  |  |  |  |  |  |  |  |  |  |  |  | 762,000,000 |  |  |  |
Gain on sale of businesses |  |  |  |  |  | 0 | $ 36,000,000 | $ (3,000,000) | $ 431,000,000 | 5,000,000 | $ 0 | $ 0 | $ 10,000,000 | 464,000,000 |  |  | 15,000,000 | 227,000,000
Proceeds from sale of businesses |  |  |  |  |  |  |  |  |  |  |  |  |  | 579,000,000 |  |  | 51,000,000 | 419,000,000
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 0 |  |  |  | 0 |  |  |  | 0 |  |  | 0 | $ 220,000,000
Additional Paid-In Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction to additional paid-in capital |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 36,000,000 |  |  |  |
Banc of America Merchant Services | Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  | 51.00% | 51.00% |  |  |  |  |  |  | 51.00% |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remeasurement of retained interests | $ 176,000,000 |  |  | $ 124,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration from sale of business | 578,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax expense from sale of business | $ 112,000,000 |  |  | 77,000,000 | $ 3,000,000 |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |
Banc Of America Merchant Services Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution of nonmonetary assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 726,000,000 |  |  |  |
Banc Of America Merchant Services Joint Venture | Bank of America |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-exclusive agreement (in years) |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Banc Of America Merchant Services Joint Venture | Joint Venture | Bank of America |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on deconsolidation |  |  |  |  |  |  | $ 36,000,000 |  |  |  |  |  |  |  |  |  |  |
Tax expense |  |  |  |  |  |  | 13,000,000 |  |  |  |  |  |  |  |  |  |  |
Remeasurement of retained interests |  |  |  |  |  |  | 700,000,000 |  |  |  |  |  |  |  |  |  |  |
Estimated additional consideration |  |  |  |  |  |  | 24,000,000 |  |  |  |  |  |  |  |  |  |  |
Investment Services Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Controlling interest sold (as a percent) | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained interest after disposition (as a percent) | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Services Business | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of businesses |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 428,000,000 |  |  |  |
Investment Services Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain from sale of business |  |  |  | $ 227,000,000 | $ 14,000,000 |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |
Fiserv Automotive Solutions, LLC | Fintech |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Controlling interest sold (as a percent) |  |  |  | 55.00% |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |
Lending Joint Ventures | Fintech |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained interest after disposition (as a percent) |  |  |  | 45.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
defi SOLUTIONS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained interest after disposition (as a percent) |  |  |  |  | 31.00% |  |  |  |  |  |  |  |  |  |  |  |  |
First Data |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of business acquired |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity shares issued per acquiree share (in shares) |  | 0.303 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of First Data debt |  | $ 16,414,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, expected to be tax deductible |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustment, increase (decrease) in goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 304,000,000 |  |  |
Measurement period adjustment, intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (155,000,000) |  |  |
Measurement period adjustment, noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (126,000,000) |  |  |
Measurement period adjustment, fair value of property and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (25,000,000) |  |  |
Measurement period adjustment, increase payables and accrued expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37,000,000 |  |  |
Measurement period adjustments, reduction to investments in unconsolidated entities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,000,000 |  |  |
Measurement period adjustment, increase in other long-term liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,000,000 |  |  |
Measurement period adjustment, recognized deferred tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 169,000,000 | $ 136,000,000 |  |
Revenue of acquiree since acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,100,000,000 |
Operating income of acquiree since acquisition date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000,000.0 |
Transaction expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 175,000,000 |
Payments for acquisitions of businesses |  | 46,475,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 30,811,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Data | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 77,000,000 |
First Data | Debt Financing Activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transaction expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 98,000,000 |
First Data | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued for acquisition (in shares) |  | 286,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Data | Equity Awards |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued for acquisition (in shares) |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Elan Financial Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustment, increase (decrease) in goodwill |  |  |  |  |  |  | $ (24,000,000) |  |  |  |  |  |  |  |  |  |  |
Payments for acquisitions of businesses |  |  | $ 659,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price |  |  | 691,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working capital adjustments |  |  | 57,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earn-out provisions, fair value |  |  | 12,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future payments under a transition services agreement |  |  | $ 13,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Transition services agreement term (in years) |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | $ 214,000,000 |  |  |  |  |  |  | $ 214,000,000 |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, expected to be tax deductible |  |  |  |  |  | $ 36,000,000 |  |  |  |  |  |  |  | $ 36,000,000 |  |  |  |
Payments for acquisitions of businesses |  |  |  |  |  |  |  |  |  |  |  |  |  | 167,000,000 |  |  |  |
Earn-out provisions, fair value |  |  |  |  |  | 45,000,000 |  |  |  |  |  |  |  | 45,000,000 |  |  |  |
Cash acquired from acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |
Goodwill |  |  |  |  |  | 90,000,000 |  |  |  |  |  |  |  | 90,000,000 |  |  |  |
Net assumed liabilities |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |  | 4,000,000 |  |  |  |
Series of Individually Immaterial Business Acquisitions | Software And Customer Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Software and customer intangible assets from acquisitions |  |  |  |  |  | 46,000,000 |  |  |  |  |  |  |  | 46,000,000 |  |  |  |
Series of Individually Immaterial Business Acquisitions | Residual Buyout Intangible Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Software and customer intangible assets from acquisitions |  |  |  |  |  | $ 35,000,000 |  |  |  |  |  |  |  | $ 35,000,000 |  |  |  |

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