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Acquisitions and Dispositions - Narrative (Details) - USD ($) $ in Millions |  |  |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 01, 2021 | Feb. 02, 2021 | Jan. 22, 2021 | Feb. 18, 2020 | Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Jun. 30, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 36,380 |  |  | $ 36,322 |
Tax expense |  |  |  |  | 113 |  |  |  |
Net pre-tax gain |  |  |  |  | 16 |  | $ (6) |  |
Tax expense |  |  |  |  | 18 |  | 79 |  |
Banc of America Merchant Services | Corporate joint venture |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interest in joint venture |  |  |  |  |  |  |  |  | 51.00%
Banc of America Merchant Services Joint Venture | Bank Of America |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Processing and other support services agreement, term (in years) |  |  |  |  |  | 5 years |  |  |
Investment Services Business |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Controlling interest sold (as a percent) |  |  |  | 60.00% |  |  |  |  |
Percentage of interest owned in affiliate |  |  |  | 40.00% |  |  |  |  |
Wealthtech |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interest owned in affiliate |  | 24.00% |  |  |  |  |  |  |
Capital contribution |  | $ 200 |  |  |  |  |  |  |
Net pre-tax gain |  |  |  |  | 28 |  |  |  |
Tax expense |  |  |  |  | 6 |  |  |  |
Disposal Group, Disposed of by Sale |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Consideration from sale of business |  |  |  | $ 584 |  |  |  |  |
Tax expense |  |  |  |  |  |  | 113 |  |
Revaluation/Remeasurement gain |  |  |  |  |  |  | 177 |  |
Disposal Group, Disposed of by Sale | Investment Services Business |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Controlling interest sold (as a percent) |  |  |  | 60.00% |  |  |  |  |
Pre-tax gain on sale |  |  |  |  |  |  | $ 431 |  |
Ondot |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payments for acquisitions of businesses |  |  | $ 270 |  |  |  |  |  |
Acquired cash |  |  | 13 |  |  |  |  |  |
Pre-tax gain from remeasurement |  |  |  |  | 12 |  |  |  |
Goodwill |  |  | $ 210 |  |  |  |  |  |
Radius8 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payments for acquisitions of businesses | $ 14 |  |  |  |  |  |  |  |
Other Acquisitions |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payments for acquisitions of businesses |  |  |  |  | 167 |  |  |  |
Acquired cash |  |  |  |  | 2 |  |  |  |
Earn-out provisions estimated value |  |  |  |  | 45 |  |  |  |
Goodwill |  |  |  |  | 90 |  |  |  |
Net assumed liabilities |  |  |  |  | 4 |  |  |  |
Goodwill, expected tax deductible amount |  |  |  |  | 36 |  |  |  |
Other Acquisitions | Software And Customer Intangible Assets |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | 46 |  |  |  |
Other Acquisitions | Residual buyouts |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | $ 35 |  |  |  |

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