Derivative Financial Instruments - Amounts Related to Derivative Instruments Not Designated as Hedges (Details) - Not designated as hedges - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gain (Loss) Recognized in Income	$ 93	$ 279	$ 114
Client-related and other risk management | Interest rate contracts | Investment banking and trading income and other income
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gain (Loss) Recognized in Income	193	44	76
Client-related and other risk management | Foreign exchange contracts | Investment banking and trading income and other income
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gain (Loss) Recognized in Income	133	(45)	(13)
Client-related and other risk management | Equity contracts | Investment banking and trading income and other income
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gain (Loss) Recognized in Income	(21)	(4)	(3)
Client-related and other risk management | Credit Contract | Investment banking and trading income and other income
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gain (Loss) Recognized in Income	(83)	178	(25)
Client-related and other risk management | Commodity Contract | Investment banking and trading income
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gain (Loss) Recognized in Income	7	6	0
Mortgage banking | Interest rate contracts | Residential mortgage income
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gain (Loss) Recognized in Income	(21)	(418)	(61)
Mortgage banking | Interest rate contracts | Commercial mortgage income
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gain (Loss) Recognized in Income	(2)	3	(4)
MSRs | Interest rate contracts | Residential mortgage income
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gain (Loss) Recognized in Income	(105)	495	137
MSRs | Interest rate contracts | Commercial mortgage income
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gain (Loss) Recognized in Income	$ (8)	$ 20	$ 7