Derivatives and Hedging Activities - Gains and Losses (Details) - Interest Rate Contract - Fair Value Hedges - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Fixed-rate long-term debt	$ (137)	$ (60)	$ (400)	$ 73
Derivatives designated as hedging instruments	137	60	400	(74)
Total	$ 0	$ 0	$ 0	$ (1)