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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Available For Sale Securities [Abstract]
Due in one year or less	$ 472
Due after one year through five years	90
Due after five years through ten years	189
Due after ten years	373
Mortgage-backed and asset-backed	397
Total fixed-maturity investments	1,521
Due in one year or less	472
Due after one year through five years	91
Due after five years through ten years	172
Due after ten years	279
Mortgage-backed and asset-backed	387
Total fixed-maturity investments	$ 1,401	$ 1,236
Investment, Type [Extensible Enumeration]	Fixed Maturities [Member]	Fixed Maturities [Member]

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