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, 2025	Mar. 31, 2024
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	$ 69	$ (33)
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	11	39
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	(49)	65
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	53	(17)
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	14	(24)
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	2
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		$ (98)
MSR and mortgage banking \| Interest rate contracts \| Mortgage banking income
Derivative Instruments, Notional, Fair Value Assets and Liabilities[Line Items]
Pre-tax Gain (Loss) Recognized in Income	$ 37