Derivative Financial Instruments - Amounts Related to Derivative Instruments Not Designated as Hedges (Details) - Not designated as hedges - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gain (Loss) Recognized in Income	$ 8	$ (167)
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	56	102
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	32	26
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	5	(8)
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	8	(34)
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	5	2
Mortgage banking | Interest rate contracts | Residential mortgage income
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gain (Loss) Recognized in Income	261	91
Mortgage banking | Interest rate contracts | Commercial mortgage income
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gain (Loss) Recognized in Income	(1)	(1)
MSRs | Interest rate contracts | Residential mortgage income
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gain (Loss) Recognized in Income	(349)	(333)
MSRs | Interest rate contracts | Commercial mortgage income
Derivative Instruments, Gain (Loss) [Line Items]
Pre-tax Gain (Loss) Recognized in Income	$ (9)	$ (12)