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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		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 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	4,945		4,945		4,838
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items	2		2		$ (103)
Interest rate contracts \| Interest on long-term debt
Derivatives, Fair Value
Change in fair value of interest rate swaps hedging long-term debt	37	$ (23)	105	$ (114)
Change in fair value of hedged long-term debt attributable to the risk being hedged	$ (37)	$ 23	$ (105)	$ 114