Derivative Financial Instruments - Impact of Derivatives on Consolidated Statement of Income (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	$ 180	$ 167	$ 601	$ 513
Foreign exchange contracts | Foreign exchange trading services
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	207	186	676	617
Foreign exchange contracts | Interest expense
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	(16)	16	0	53
Interest rate contracts
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	0	0	0	1
Other derivative contracts
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	$ (11)	$ (35)	$ (75)	$ (158)