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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	$ 246	$ 120	$ 254	$ (47)
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	72	12	128	114
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	147	8	179	34
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	2	(12)	7	(20)
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	83	(27)	91	(61)
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	(5)	3	0	5
Mortgage banking | Interest rate contracts | Residential mortgage income
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	217	(88)	478	3
Mortgage banking | Interest rate contracts | Commercial mortgage income
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	0	0	(1)	(1)
Loan Servicing Rights | Interest rate contracts | Residential mortgage income
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	(265)	219	(614)	(114)
Loan Servicing Rights | Interest rate contracts | Commercial mortgage income
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	$ (5)	$ 5	$ (14)	$ (7)