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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Available For Sale Securities [Abstract] |  |
Due in one year or less | $ 395 |
Due after one year through five years | 121 |
Due after five years through ten years | 200 |
Due after ten years | 395 |
Mortgage-backed and asset-backed | 356 |
Total fixed-maturity investments | 1,467 |
Due in one year or less | 394 |
Due after one year through five years | 121 |
Due after five years through ten years | 178 |
Due after ten years | 299 |
Mortgage-backed and asset-backed | 341 |
Total fixed-maturity investments | $ 1,333 | $ 1,236
Investment, Type [Extensible Enumeration] | Fixed Maturities [Member] | Fixed Maturities [Member]

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