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, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	$ (252)	$ (17)	$ (359)	$ (515)
Interest rate
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	(69)	122	(58)	(123)
Credit
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	(140)	(143)	(374)	(424)
Foreign exchange
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	(26)	4	82	32
Equity
Gain (Loss) on Derivative Instruments, Net, Pretax
Derivatives gains/(losses) recorded in income	$ (17)	$ 0	$ (9)	$ 0