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Acquisitions and Dispositions - Narrative (Details) - USD ($) $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  | 2 Months Ended | 3 Months Ended | 12 Months Ended |
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Dec. 20, 2022 | Oct. 17, 2022 | Sep. 30, 2022 | Apr. 01, 2022 | Nov. 22, 2021 | Jun. 30, 2021 | Jun. 14, 2021 | May 04, 2021 | Feb. 02, 2021 | Jan. 22, 2021 | Jul. 01, 2020 | Feb. 18, 2020 | May 11, 2020 | Sep. 01, 2022 | Jun. 14, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 988 | $ 848 | $ 139 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,811 | 36,433 | 36,322 |
Tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 551 | 363 | 196 |
Noncontrolling interest decrease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 762 |
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Gain (Loss) on Disposition of Assets |
Net pre-tax gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 220 | 100 | $ 0 |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest decrease |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 726 |
Additional Paid-In Capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest decrease |  |  |  |  |  |  |  |  |  |  | $ 36 |  |  |  |  |  |  | 36 |
Banc of America Merchant Services | Corporate Joint Venture |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest in joint venture |  |  |  |  |  |  |  |  |  |  | 51.00% |  |  |  |  |  |  |  | 51.00%
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration from sale of business |  |  |  |  |  |  |  |  |  |  |  | $ 578 |  |  |  |  |  |  |
Revaluation/Remeasurement gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 176 |
Tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 112 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Korea Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration from sale of business |  |  | $ 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of businesses and other assets |  |  | 43 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Part noncash divestiture, amount of consideration received |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of business |  |  | (127) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Fiserv Costa Rica, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration from sale of business |  | $ 49 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposition of business |  | 44 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax expense |  | $ 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Banc Of America Merchant Services Joint Venture | Bank Of America |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax expense |  |  |  |  |  |  |  |  |  |  | $ 13 |  |  |  |  |  |  |  |
Pre-tax gain |  |  |  |  |  |  |  |  |  |  | 36 |  |  |  |  |  |  |  |
Revaluation/Remeasurement gain |  |  |  |  |  |  |  |  |  |  | 700 |  |  |  |  |  |  |  |
Additional consideration due from the Company |  |  |  |  |  |  |  |  |  |  | 24 |  |  |  |  |  |  |  |
Banc Of America Merchant Services Joint Venture | Bank Of America | Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest decrease |  |  |  |  |  |  |  |  |  |  | $ 726 |  |  |  |  |  |  |  |
Investment Services Business |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Controlling interest sold (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |
Percentage of interest owned in affiliate |  |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |
Investment Services Business | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 428 |
InvestCloud Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |
Capital contribution |  |  |  |  |  |  |  |  | $ 200 |  |  |  |  |  |  |  |  |  |
Net pre-tax gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28 |  |  |
InvestCloud Holdings, LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |
Proceeds from sale of entire ownership interest |  |  |  |  |  | $ 466 |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain on sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33 |  |  |
Merchant One, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire businesses, net of cash acquired | $ 302 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired cash | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets | $ 178 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average useful life (in years) | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 118 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other net assets | $ 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finxact, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired cash |  |  |  | $ 27 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  | $ 105 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average useful life (in years) |  |  |  | 6 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 670 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other net assets |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments for acquisitions of businesses |  |  |  | $ 645 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax gain from remeasurement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 110 |  |  |
BentoBox |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired cash |  |  |  |  | $ 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | $ 52 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average useful life (in years) |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 266 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other net assets |  |  |  |  | 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash purchase price |  |  |  |  | $ 317 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustment, increase (decrease) in goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62 |  |  |
Measurement period adjustment, intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (84) |  |  |
Measurement period adjustment, recognized deferred tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 22 |  |  |
Pineapple Payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired cash |  |  |  |  |  |  |  | $ 6 |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  | $ 127 |  |  |  |  |  |  |  |  |  |  |
Weighted-average useful life (in years) |  |  |  |  |  |  |  | 14 years |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 79 |  |  |  |  |  |  |  |  |  |  |
Other net assets |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |
Payments for acquisitions of businesses |  |  |  |  |  |  |  | 207 |  |  |  |  |  |  |  |  |  |  |
Earn-out provisions estimated fair value |  |  |  |  |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |
Goodwill, expected tax deductible amount |  |  |  |  |  |  |  | $ 59 |  |  |  |  |  |  |  |  |  |  |
Ondot |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired cash |  |  |  |  |  |  |  |  |  | $ 13 |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  | $ 142 |  |  |  |  |  |  |  |  |
Weighted-average useful life (in years) |  |  |  |  |  |  |  |  |  | 6 years |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | $ 173 |  |  |  |  |  |  |  |  |
Payments for acquisitions of businesses |  |  |  |  |  |  |  |  |  | $ 271 |  |  |  |  |  |  |  |  |
Pre-tax gain from remeasurement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12 |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23 |  |  |  |  |
Weighted-average useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 years |  |  |  |  |
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 |  |  |  |  |
SpendLabs and Radius8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 47 |  |  |  |  |  |  |  | $ 47 |  |  |  |
Weighted-average useful life (in years) |  |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 61 |  |  |  |  |  |  |  | 61 |  |  |  |
Payments for acquisitions of businesses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 87 |  |  |  |
Earn-out provisions estimated fair value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |
Net assumed liabilities |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  | 7 |  |  |  |
Goodwill, expected tax deductible amount |  |  |  |  |  |  | $ 14 |  |  |  |  |  |  |  | $ 14 |  |  |  |
MerchantPro, Bypass, and Inlet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired cash |  |  |  |  |  |  |  |  |  |  |  |  | $ 2 |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 81 |  |  |  |  |  |
Weighted-average useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  | 11 years |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  | $ 90 |  |  |  |  |  |
Payments for acquisitions of businesses |  |  |  |  |  |  |  |  |  |  |  |  | 167 |  |  |  |  |  |
Earn-out provisions estimated fair value |  |  |  |  |  |  |  |  |  |  |  |  | 45 |  |  |  |  |  |
Net assumed liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |
Goodwill, expected tax deductible amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 36 |  |  |  |  |  |

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