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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Available For Sale Securities [Abstract] |  |
Due in one year or less | $ 573 |
Due after one year through five years | 162 |
Due after five years through ten years | 192 |
Due after ten years | 446 |
Mortgage-backed and asset-backed | 315 |
Total fixed-maturity investments | 1,688 |
Due in one year or less | 573 |
Due after one year through five years | 158 |
Due after five years through ten years | 169 |
Due after ten years | 362 |
Mortgage-backed and asset-backed | 295 |
Total fixed-maturity investments | $ 1,557 | $ 1,931
Investment, Type [Extensible Enumeration] | Fixed Maturities [Member] | Fixed Maturities [Member]

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