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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	$ (233)	$ 64	$ (164)	$ 31
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	10	27	21	66
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	(164)	36	(213)	101
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	(38)	7	15	(10)
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)	14	(12)	(10)
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	3	4	6	6
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	$ (18)	$ (24)	$ 19	$ (122)