Derivatives - Other Risk Management Derivatives (Details) - Other income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Interest rate risk on mortgage activities
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives not designated as hedging	$ (147)	$ (171)
Credit risk on loans
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives not designated as hedging	(3)	(17)
Interest rate and foreign currency risk on ALM activities
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives not designated as hedging	1,310	1,261
Price risk on deferred compensation hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives not designated as hedging	$ (335)	$ 280