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Acquisitions and Dispositions - Narrative (Details) - USD ($) $ in Millions |  |  |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 25, 2023 | Dec. 20, 2022 | Oct. 17, 2022 | Sep. 30, 2022 | Apr. 01, 2022 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 01, 2022 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for acquisition of businesses, net of cash acquired |  |  |  |  |  |  |  |  |  | $ 0 | $ 668 |
Goodwill |  |  |  |  |  |  | $ 37,109 |  |  | 37,109 |  | $ 36,811
Tax expense |  |  |  |  |  |  | 181 |  | $ 137 | 305 | 235 |
Part noncash divestiture, amount of consideration received |  |  |  |  |  |  |  |  |  | 0 | $ 111 |
Disposal Group, Disposed of by Sale | Financial Reconciliation Business |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Disposal group, current assets |  |  |  |  |  |  | 70 |  |  | 70 |  |
Disposal group, current liabilities |  |  |  |  |  |  | $ 15 |  |  | 15 |  |
Disposal Group, Disposed of by Sale | Financial Reconciliation Business | Forecast |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of business |  |  |  |  |  | $ 160 |  |  |  |  |  |
Disposal Group, Disposed of by Sale | Financial Reconciliation Business | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of businesses and other assets | $ 230 |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale | Fiserv Costa Rica, S.A. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of business |  |  | $ 44 |  |  |  |  |  |  | (3) |  |
Consideration from sale of business |  |  | 49 |  |  |  |  |  |  |  |  |
Tax expense |  |  | $ 8 |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale | Korea Operations |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of businesses and other assets |  |  |  | $ 43 |  |  |  |  |  |  |  |
Gain (loss) on disposition of business |  |  |  | (127) |  |  |  |  |  |  |  |
Consideration from sale of business |  |  |  | 50 |  |  |  |  |  |  |  |
Part noncash divestiture, amount of consideration received |  |  |  | 7 |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, goodwill |  |  |  | 40 |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, intangible assets |  |  |  | 48 |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, accumulated foreign currency translation loss |  |  |  | $ 56 |  |  |  |  |  |  |  |
Merchant One, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Payments for acquisition of businesses, net of cash acquired |  | $ 302 |  |  |  |  |  |  |  |  |  |
Acquired cash |  | 1 |  |  |  |  |  |  |  |  |  |
Increase (decrease) in goodwill |  |  |  |  |  |  |  |  |  | $ 61 |  |
Intangible assets |  | 118 |  |  |  |  |  |  |  |  |  |
Goodwill |  | 179 |  |  |  |  |  |  |  |  |  |
Other net assets |  | $ 6 |  |  |  |  |  |  |  |  |  |
Finxact, Inc. |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | $ 105 |  |  |  |  |  |  |
Goodwill |  |  |  |  | 670 |  |  |  |  |  |  |
Other net assets |  |  |  |  | 1 |  |  |  |  |  |  |
Payments for acquisitions of businesses |  |  |  |  | $ 645 |  |  |  |  |  |  |
Pre-tax gain from remeasurement |  |  |  |  |  |  |  |  | $ 110 |  |  |
Other 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 |  |  |  |

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