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
	Mar. 31, 2026	Mar. 31, 2025
Derivative instruments gain (loss):
Gains/(losses) recognized in earnings on hedging derivatives	$ (14)	$ (1)
Gains/(losses) recognized in earnings for excluded components	12	(1)
Gains/(losses) recognized in earnings for hedged items	14	1
Net Impact	$ 12	$ (1)