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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, 2022 | Dec. 31, 2021
--- | --- | ---
Available For Sale Securities [Abstract] |  |
Due in one year or less | $ 379 |
Due after one year through five years | 294 |
Due after five years through ten years | 342 |
Due after ten years | 772 |
Mortgage-Backed and Asset-Backed | 582 |
Total Available-For-Sale, amortized cost | 2,369 |
Due in one year or less | 378 |
Due after one year through five years | 278 |
Due after five years through ten years | 292 |
Due after ten years | 630 |
Mortgage-Backed and Asset-Backed | 528 |
Total Available-For-Sale, fair value | $ 2,106 | $ 2,457

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