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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Feb. 18, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |
Effective income tax rate |  | 5.60% | 17.10%
Tax expense |  | $ 113 |
Unrecognized tax benefits |  | 179 |
Decrease in unrecognized tax benefits reasonably possible |  | $ 57 |
Investment Services Business |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Controlling interest sold (as a percent) | 60.00% |  |
Disposal Group, Disposed of by Sale |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Tax expense |  |  | $ 113
Disposal Group, Disposed of by Sale | Investment Services Business |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Pre-tax gain on sale |  |  | $ 431
Controlling interest sold (as a percent) | 60.00% |  |

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