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Investment in Unconsolidated Affiliate - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 29, 2018 USD ($) | Aug. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) affiliate | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) affiliate | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Feb. 15, 2019 USD ($) | Mar. 28, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of businesses |  |  |  |  |  |  |  |  |  |  |  | $ 51,000,000 | $ 419,000,000 | $ 17,000,000 |  |
Gain on sale of businesses |  |  |  | $ 5,000,000 | $ 0 | $ 0 | $ 10,000,000 | $ 0 | $ (2,000,000) | $ (3,000,000) | $ 232,000,000 | 15,000,000 | 227,000,000 | 10,000,000 |  |
Other long-term liabilities |  |  |  | 941,000,000 |  |  |  | 170,000,000 |  |  |  | 941,000,000 | 170,000,000 |  |  |
Revenue |  |  |  | $ 4,045,000,000 | $ 3,128,000,000 | $ 1,512,000,000 | $ 1,502,000,000 | 1,551,000,000 | $ 1,412,000,000 | $ 1,420,000,000 | $ 1,440,000,000 | $ 10,187,000,000 | 5,823,000,000 | 5,696,000,000 |  |
Number of affiliates accounted for as equity method investments | affiliate |  |  |  | 18 |  |  |  |  |  |  |  | 18 |  |  |  |
Dividend from unconsolidated affiliate that represents a return on investment |  |  |  |  |  |  |  |  |  |  |  | $ 23,000,000 | 2,000,000 | 45,000,000 |  |
Investments in unconsolidated affiliates |  |  |  | $ 2,720,000,000 |  |  |  | 65,000,000 |  |  |  | 2,720,000,000 | 65,000,000 |  |  |
Excess cash dividend recorded as income |  |  |  |  |  |  |  |  |  |  |  | 29,000,000 | 10,000,000 | 32,000,000 |  |
Cash distributions from unconsolidated affiliate |  |  |  |  |  |  |  |  |  |  |  | 136,000,000 | 2,000,000 | 45,000,000 |  |
Equity securities without readily determinable fair value |  |  |  | $ 167,000,000 |  |  |  |  |  |  |  | 167,000,000 |  |  |  |
Sagent Auto, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained interest after disposition (as a percent) |  |  | 31.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain related to merger |  |  |  |  |  |  |  |  |  |  |  | 14,000,000 |  |  |  |
Gain related to merger, tax |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |
StoneRiver Group L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained interest after disposition (as a percent) |  |  |  | 49.00% |  |  |  |  |  |  |  | 49.00% |  |  |  |
Pre-tax gain related to merger |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,000,000 |  |
Gain related to merger, tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 |  |
Dividend from unconsolidated affiliate that represents a return on investment |  |  |  |  |  |  |  |  |  |  |  | $ 0 | 2,000,000 | 45,000,000 |  |
Investments in unconsolidated affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Excess cash dividend recorded as income |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |
Excess cash dividend recorded as income, tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,000,000 |  |
Financial | Fiserv Automotive Solutions, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Controlling interest sold (as a percent) |  | 55.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial | Fiserv LS LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Controlling interest sold (as a percent) |  | 55.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial | Lending Solutions Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of businesses |  | $ 419,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of businesses |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |
Gain on sale of businesses, tax |  | 77,000,000 |  |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  |
Remeasurement of retained interests |  | $ 124,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retained interest after disposition (as a percent) |  | 45.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities |  |  |  | $ 34,000,000 |  |  |  |  |  |  |  | 34,000,000 |  |  |  |
Other (expense) income |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 | 5,000,000 |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,500,000,000 |
Line of Credit | Variable-Rate Term Loan Facilities Due March 2023 | Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 350,000,000
Amount outstanding |  |  |  | $ 0 |  |  |  | $ 0 |  |  |  | 0 | 0 |  |  |
Line of Credit | Variable-Rate Revolving Credit Facilities Due March 2023 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 35,000,000
Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  | (42,000,000) | (39,000,000) | (68,000,000) |  |
Corporate and Other | Lending Solutions Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of businesses |  |  |  |  |  |  |  |  |  |  |  |  | 227,000,000 |  |  |
Processing and services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | [1] |  |  |  |  |  |  |  |  |  |  | 8,573,000,000 | 4,975,000,000 | 4,833,000,000 |  |
Processing and services | Affiliated Entity | Financial | Lending Solutions Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  | 36,000,000 | 30,000,000 |  |  |
Processing and services | Corporate and Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |  | $ 49,000,000 | $ 43,000,000 | $ 10,000,000 |  |
Sagent Auto, LLC | Line of Credit | Variable-Rate Term Loan Facilities Due March 2023 | Term Loan Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in borrowing capacity |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Sagent Auto, LLC | Line of Credit | Variable-Rate Revolving Credit Facilities Due March 2023 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in borrowing capacity |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Guarantee | Sagent Auto, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guarantor obligations |  |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Includes processing and other fees charged to related party investments accounted for under the equity method of $112 million, $28 million and $0 million for the years ended December 31, 2019, 2018 and 2017, respectively (see Notes 9 and 20).

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