Derivatives and Hedging Activities - Gains and Losses (Details) - Interest Rate Contracts - Fair Value Hedging - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Fixed-rate long-term debt	$ (339)	$ 26	$ (289)
Derivatives designated as hedging instruments	340	(27)	290
Total	$ 1	$ (1)	$ 1