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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Available For Sale Securities [Abstract]
Due in one year or less	$ 329
Due after one year through five years	149
Due after five years through ten years	202
Due after ten years	438
Mortgage-backed and asset-backed	273
Total fixed-maturity investments	1,391
Due in one year or less	329
Due after one year through five years	146
Due after five years through ten years	176
Due after ten years	332
Mortgage-backed and asset-backed	253
Total fixed-maturity investments	$ 1,236	$ 1,557
Investment, Type [Extensible Enumeration]	Fixed Maturities [Member]	Fixed Maturities [Member]

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