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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 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available For Sale Securities [Abstract] |  |
Due in one year or less | $ 172 |
Due after one year through five years | 379 |
Due after five years through ten years | 280 |
Due after ten years | 671 |
Mortgage-backed and asset-backed | 412 |
Total fixed-maturity investments | 1,914 |
Due in one year or less | 172 |
Due after one year through five years | 364 |
Due after five years through ten years | 233 |
Due after ten years | 518 |
Mortgage-backed and asset-backed | 374 |
Total fixed-maturity investments | $ 1,661 | $ 1,931

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