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
Mar. 31, 2026	Mar. 31, 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)
Long-term debt
Derivatives, Fair Value
Carrying amount of the hedged items	6,081		4,204
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items	(10)		$ 10
Interest rate contracts \| Interest on long-term debt
Derivatives, Fair Value
Change in fair value of interest rate swaps hedging long-term debt	(19)	$ 68
Change in fair value of hedged long-term debt attributable to the risk being hedged	$ 20	$ (68)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk, remaining after discontinued hedge. Excludes cumulative basis adjustment related to foreign exchange risk.

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Amount of liability hedged in fair value hedging relationship.

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Amount of unrealized gain (loss) included in earnings related to the fair value of the hedged item in an interest rate fair value hedge, offset by the gain (loss) on the hedging instrument to the extent that the fair value hedge is determined to be effective.

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Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective.

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