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, 2023	Mar. 31, 2022
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	$ 14	$ 8
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	34	56
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	(3)	32
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	5
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	(33)	8
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	10	5
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	(1)	261
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	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	1	(349)
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	$ 3	$ (9)