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Derivative Financial Instruments - Additional Information (Detail) - USD ($)	Jun. 30, 2025	Dec. 31, 2024
Derivative Instruments Gain Loss [Line Items]
Derivative liability at fair value including accrued interest and premium receivable	$ 85,000,000	$ 250,000,000
Net positive exposure related to corporate derivatives	6,000,000	9,000,000
Net positive exposure on foreign currency swaps	4,000,000	$ 0
Counterparty [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative liability at fair value including accrued interest and premium receivable	$ 0

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- Definition

The net amount as of the balance sheet date of the fair value of derivative assets and derivative liabilities that in accordance with the entity's accounting policy were offset against collateral under a master netting arrangement.

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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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The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

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Fair value as of the balance sheet date of all derivatives designated as foreign currency fair value hedging instruments.

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