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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - Fixed Maturities [Member] - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available For Sale Securities [Abstract] |  |
Due in one year or less | $ 119 |
Due after one year through five years | 353 |
Due after five years through ten years | 310 |
Due after ten years | 729 |
Mortgage-backed and asset-backed | 451 |
Total fixed-maturity investments | 1,962 |
Due in one year or less | 119 |
Due after one year through five years | 341 |
Due after five years through ten years | 269 |
Due after ten years | 623 |
Mortgage-backed and asset-backed | 420 |
Total fixed-maturity investments | $ 1,772 | $ 1,931

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