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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, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
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	$ (7)		$ (7)		$ (7)
Long-term debt
Derivatives, Fair Value
Carrying amount of the hedged items	7,280		7,280		4,204
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items	(55)		(55)		$ 10
Interest rate contracts \| Income Statement Location [Axis]: us-gaap:InterestExpenseLongTermDebt
Derivatives, Fair Value
Change in fair value of interest rate swaps hedging long-term debt	(45)	$ 37	(64)	$ 105
Change in fair value of hedged long-term debt attributable to the risk being hedged	$ 45	$ (37)	$ 65	$ (105)