Derivative Instruments - Impact on Statements of Income, Risk Management Derivatives (Details) - Risk Management Activities - Not designated as hedges - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives gains/(losses) recorded in income	$ 134	$ 35
Interest rate
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives gains/(losses) recorded in income	104	56
Credit
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives gains/(losses) recorded in income	20	(60)
Foreign exchange
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives gains/(losses) recorded in income	(9)	41
Equity
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives gains/(losses) recorded in income	$ 19	$ (2)