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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Feb. 18, 2020 | Mar. 31, 2020 | Mar. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |
Effective income tax rate |  | 17.10% | 11.90%
Unrecognized tax benefits |  | $ 146 |
Decrease in unrecognized tax benefits reasonably possible |  | $ 37 |
Investment Services Business |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Controlling interest sold (as a percent) | 60.00% |  |
Disposal Group, Held-for-sale or Disposed of by Sale |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Tax expense | $ 113 |  |
Disposal Group, Held-for-sale or Disposed of by Sale | Investment Services Business |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Tax expense | 113 |  |
Pre-tax gain on sale | $ 431 |  |

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