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Investments in fixed maturity securities - Amortized cost and estimated fair value of securities with fixed maturities (Detail) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Summary of Investment Holdings [Line Items] |  |
Due in one year or less - amortized cost | $ 9,595 |
Due after one year through five years - amortized cost | 4,444 |
Due after five years through ten years - amortized cost | 556 |
Due after ten years - amortized cost | 125 |
Amortized cost of mortgage-backed securities | 123 |
Amortized cost of fixed maturity securities | 14,843 | $ 15,214
Due in one year or less - fair value | 9,531 |
Due after one year through five years - fair value | 4,486 |
Due after five years through ten years - fair value | 746 |
Due after ten years - fair value | 136 |
Fair value of mortgage-backed securities | 136 |
Fair value of fixed maturity securities | $ 15,035 | $ 15,364

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