Derivative Instruments - Impact on Statements of Income, Risk Management Derivatives (Details) - Risk Management Activities - Not designated as hedges - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	$ (1,039)	$ (578)	$ (824)
Interest rate
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	(425)	(135)	(827)
Credit
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	(604)	(441)	51
Foreign exchange
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	$ (10)	$ (2)	$ (48)