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Derivative Instruments - Summary of Gross Principal Notional Outstanding for CDS Contracts (Detail) - Variable Interest Entity [Member] - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Interest Rate Swap [Member] |  |
Ambac Rating |  |
Derivative, Notional Amount | $ 1,662 | $ 1,573
Interest Rate Swap One [Member] |  |
Ambac Rating |  |
Derivative, Notional Amount | 864 | 887
Currency Swaps [Member] |  |
Ambac Rating |  |
Derivative, Notional Amount | $ 149 | $ 176

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