Derivative Financial Instruments - Impact of Derivatives on Consolidated Statement of Income (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	$ 183	$ 204
Foreign exchange contracts | Foreign exchange trading services
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	232	239
Foreign exchange contracts | Interest expense
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	5	13
Interest rate contracts
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	1	6
Other derivative contracts
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	$ (55)	$ (54)