Derivative Instruments - Impact on Statements of Income, Risk Management Derivatives (Details) - Risk Management Activities - Not designated as hedges - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	$ (17)	$ (320)	$ (515)	$ (566)
Interest rate
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	122	(259)	(123)	(385)
Credit
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	(143)	(39)	(424)	(202)
Foreign exchange
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	$ 4	$ (22)	$ 32	$ 21