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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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