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Investments in fixed maturity securities - Amortized cost and estimated fair value of securities with fixed maturities (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Summary of Investment Holdings [Line Items] |  |
Due in one year or less - amortized cost | $ 10,228 |
Due after one year through five years - amortized cost | 4,202 |
Due after five years through ten years - amortized cost | 532 |
Due after ten years - amortized cost | 123 |
Amortized cost of mortgage-backed securities | 129 |
Amortized cost of fixed maturity securities | 15,214 | $ 23,525
Due in one year or less - fair value | 10,107 |
Due after one year through five years - fair value | 4,267 |
Due after five years through ten years - fair value | 718 |
Due after ten years - fair value | 133 |
Fair value of mortgage-backed securities | 139 |
Fair value of fixed maturity securities | $ 15,364 | $ 23,758

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