Derivative Instruments - Impact on Statements of Income, Risk Management Derivatives (Details) - Risk Management Activities - Not designated as hedges - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	$ (24)	$ (138)	$ (498)	$ (246)
Interest rate
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	(21)	(112)	(244)	(126)
Credit
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	(22)	(67)	(280)	(163)
Foreign exchange
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	$ 19	$ 41	$ 26	$ 43