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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 18, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Effective income tax rate |  | 32.50% | 20.70% | 21.10% | 17.90%
Income tax expense, revaluation of net deferred tax liabilities |  | $ 32 |  |  |
Tax expense |  |  |  | $ 112 |
Unrecognized tax benefits |  | 185 |  | 185 |
Decrease in unrecognized tax benefits reasonably possible |  | $ 66 |  | $ 66 |
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 | $ 112 |  |  |  |
Disposal Group, Disposed of by Sale | Investment Services Business |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Pre-tax gain on sale | $ 428 |  |  |  |
Controlling interest sold (as a percent) | 60.00% |  |  |  |

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