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Derivative Financial Instruments - Change in the Fair Value for Interest Rate Contracts and the Related Hedged Items (Details) - Fair Value Hedging - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Available-for-sale debt and other securities
Derivatives, Fair Value
Cumulative amount of fair value hedging adjustments remaining for hedged items for which hedge accounting has been discontinued	$ (8)		$ (8)		$ (9)
Long-term debt
Derivatives, Fair Value
Carrying amount of the hedged items	4,210		4,210		4,838
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items	17		17		$ (103)
Interest rate contracts \| Interest on long-term debt
Derivatives, Fair Value
Change in fair value of interest rate swaps hedging long-term debt	14	$ 190	120	$ 76
Change in fair value of hedged long-term debt attributable to the risk being hedged	$ (14)	$ (190)	$ (120)	$ (76)