Derivative Instruments - Cumulative Basis Adjustments for Fair Value Hedges (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Derivatives, Fair Value [Line Items]
Amortized cost of the hedged assets	$ 642	$ 645
Amortized cost of the hedged liabilities	(987)	(989)
Cumulative fair value hedging adjustment included in the amortized cost of the hedged assets	19	21
Cumulative fair value hedging adjustment included in the amortized cost of the hedged assets (liabilities)	(112)	(114)
Discontinued Hedges
Derivatives, Fair Value [Line Items]
Unamortized adjustments from discontinued hedges, assets	21	21
Cumulative fair value hedging adjustment included in the amortized cost of the hedged assets (liabilities)	$ (274)	$ (278)

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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Fair value of all derivative assets designated as fair value hedging instruments.

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

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