Derivative Financial Instruments - Amounts Related to Derivative Instruments Not Designated as Hedges (Details) - Not designated as hedges - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	$ (84)	$ 246	$ (70)	$ 254
Client-related and other risk management | Interest rate contracts | Investment banking and trading income and other income
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	52	72	86	128
Client-related and other risk management | Foreign exchange contracts | Investment banking and trading income and other income
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	(26)	147	(29)	179
Client-related and other risk management | Equity contracts | Investment banking and trading income and other income
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	(22)	2	(20)	7
Client-related and other risk management | Credit Contract | Investment banking and trading income and other income
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	(26)	83	(59)	91
Client-related and other risk management | Commodity Contract | Investment banking and trading income
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	7	(5)	17	0
Residential Mortgages | Interest rate contracts | Mortgage banking income
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	23	217	22	478
Commercial Mortgage Banking Income | Interest rate contracts | Mortgage banking income
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	(2)	0	(1)	(1)
Residential Servicing Contracts | Interest rate contracts | Mortgage banking income
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	(83)	(265)	(82)	(614)
Loan servicing rights commercial mortgages | Interest rate contracts | Mortgage banking income
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	$ (7)	$ (5)	$ (4)	$ (14)