Derivatives and Hedge Accounting - Fair Value Hedging Relationships (Details) - Derivatives designated as hedging instruments - Fair value hedging - Foreign exchange contracts - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Derivative instruments gain (loss):
Gains/(losses) recognized in earnings on hedging derivatives	$ (25)	$ 53	$ (52)	$ (62)
Gains/(losses) recognized in earnings for excluded components	(4)	6	(23)	(21)
Gains/(losses) recognized in earnings for hedged items	25	(53)	52	62
Net Impact	$ (4)	$ 6	$ (23)	$ (21)