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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 | Dec. 31, 2022 | Dec. 31, 2021
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Available For Sale Securities [Abstract] |  |
Due in one year or less | $ 199 |
Due after one year through five years | 280 |
Due after five years through ten years | 332 |
Due after ten years | 788 |
Mortgage-backed and asset-backed | 564 |
Total fixed-maturity investments | 2,163 |
Due in one year or less | 197 |
Due after one year through five years | 270 |
Due after five years through ten years | 288 |
Due after ten years | 652 |
Mortgage-backed and asset-backed | 524 |
Total fixed-maturity investments | $ 1,931 | $ 2,457

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