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Acquisitions and Dispositions - Narrative (Details) - USD ($) $ in Millions |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 01, 2023 | Jul. 25, 2023 | Dec. 20, 2022 | Oct. 17, 2022 | Sep. 30, 2022 | Apr. 01, 2022 | Mar. 31, 2025 | Sep. 01, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2023
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses, net of cash acquired |  |  |  |  |  |  |  |  | $ 0 | $ 13 | $ 988 |
Goodwill |  |  |  |  |  |  |  |  | 36,584 | 37,205 | 36,811 |
Tax expense |  |  |  |  |  |  |  |  | $ 641 | 754 | 551 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Financial Reconciliation Business |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of businesses and other assets |  | $ 235 |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of business |  |  |  |  |  |  |  |  |  | 172 |  |
Tax expense |  |  |  |  |  |  |  |  |  | 48 |  |
Disposal group, including discontinued operation, goodwill |  |  |  |  |  |  |  |  |  | 38 |  |
Disposal group, including discontinued operation, trade receivable and capitalized software |  |  |  |  |  |  |  |  |  | 15 |  |
Disposal group, including discontinued operation, accumulated foreign currency translation loss |  |  |  |  |  |  |  |  |  | 10 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Fiserv Costa Rica, S.A. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of business |  |  |  | $ 44 |  |  |  |  |  | 3 |  |
Tax expense |  |  |  | 8 |  |  |  |  |  |  |  |
Consideration from sale of business |  |  |  | $ 49 |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Korea Operations |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of businesses and other assets |  |  |  |  | $ 43 |  |  |  |  |  |  |
Gain (loss) on disposition of business |  |  |  |  | (127) |  |  |  |  |  |  |
Disposal group, including discontinued operation, goodwill |  |  |  |  | 40 |  |  |  |  |  |  |
Disposal group, including discontinued operation, accumulated foreign currency translation loss |  |  |  |  | 56 |  |  |  |  |  |  |
Consideration from sale of business |  |  |  |  | 50 |  |  |  |  |  |  |
Part noncash divestiture, amount of consideration received |  |  |  |  | 7 |  |  |  |  |  |  |
Disposal group, including discontinued operation, intangible assets |  |  |  |  | $ 48 |  |  |  |  |  |  |
Merchant One, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses, net of cash acquired |  |  | $ 302 |  |  |  |  |  |  |  |  |
Acquired cash |  |  | 1 |  |  |  |  |  |  |  |  |
Measurement period adjustment, increase (decrease) in goodwill |  |  |  |  |  |  |  |  |  | $ 61 |  |
Intangible assets |  |  | $ 118 |  |  |  |  |  |  |  |  | $ 118
Goodwill |  |  |  |  |  |  |  |  |  |  |  | 179
Other net assets |  |  |  |  |  |  |  |  |  |  |  | $ 6
Finxact, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acquired cash |  |  |  |  |  | $ 27 |  |  |  |  |  |
Intangible assets |  |  |  |  |  | 105 |  |  |  |  |  |
Goodwill |  |  |  |  |  | 670 |  |  |  |  |  |
Other net assets |  |  |  |  |  | 1 |  |  |  |  |  |
Payments for acquisitions of businesses |  |  |  |  |  | $ 645 |  |  |  |  |  |
Pre-tax gain from remeasurement |  |  |  |  |  |  |  |  |  |  | $ 110 |
Skytef and Sled |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for acquisitions of businesses | $ 17 |  |  |  |  |  |  |  |  |  |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  | $ 23 |  |  |  |
Goodwill |  |  |  |  |  |  |  | 22 |  |  |  |
Payments for acquisitions of businesses |  |  |  |  |  |  |  | 44 |  |  |  |
Earn-out provisions estimated fair value |  |  |  |  |  |  |  | 6 |  |  |  |
Other net assumed liabilities |  |  |  |  |  |  |  | 1 |  |  |  |
Goodwill, expected tax deductible amount |  |  |  |  |  |  |  | $ 17 |  |  |  |
CCV Group B.V. | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for acquisitions of businesses |  |  |  |  |  |  | $ 360 |  |  |  |  |

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