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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available For Sale Securities [Abstract] |  |
Due in one year or less | $ 418 |
Due after one year through five years | 159 |
Due after five years through ten years | 205 |
Due after ten years | 435 |
Mortgage-backed and asset-backed | 327 |
Total fixed-maturity investments | 1,544 |
Due in one year or less | 417 |
Due after one year through five years | 155 |
Due after five years through ten years | 179 |
Due after ten years | 342 |
Mortgage-backed and asset-backed | 304 |
Total fixed-maturity investments | $ 1,397 | $ 1,557
Investment, Type [Extensible Enumeration] | Fixed Maturities [Member] | Fixed Maturities [Member]

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