Derivative Financial Instruments - Impact of Derivatives on Consolidated Statement of Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Deferred compensation expense acceleration	$ 79
Derivatives not designated as hedging instruments
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	956	$ 623	$ 833
Derivatives not designated as hedging instruments | Foreign exchange contracts | Foreign exchange trading services revenue
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	862	803	938
Derivatives not designated as hedging instruments | Foreign exchange contracts | Interest expense
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	274	(54)	(20)
Derivatives not designated as hedging instruments | Interest rate contracts | Foreign exchange trading services revenue
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	21	(2)	3
Derivatives not designated as hedging instruments | Interest rate contracts | Other fee revenue
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	0	0	1
Derivatives not designated as hedging instruments | Other derivative contracts | Other fee revenue
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	(12)	(3)	0
Derivatives not designated as hedging instruments | Other derivative contracts | Compensation and employee benefits
Derivative [Line Items]
Amount of gain (loss) on derivative recognized in income	$ (189)	$ (121)	$ (89)