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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 18, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Schedule of Equity Method Investments [Line Items]          
Effective income tax rate   11.30% 32.50% 23.70% 21.10%
Income tax expense related to the revaluation of certain net deferred tax liabilities     $ 32 $ 134  
Tax expense         $ 112
Unrecognized tax benefits   $ 136   136  
Decrease in unrecognized tax benefits reasonably possible   $ 26   $ 26  
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%