Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - Fixed Maturities [Member] - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Available For Sale Securities [Abstract]
Due in one year or less	$ 119
Due after one year through five years	353
Due after five years through ten years	310
Due after ten years	729
Mortgage-backed and asset-backed	451
Total fixed-maturity investments	1,962
Due in one year or less	119
Due after one year through five years	341
Due after five years through ten years	269
Due after ten years	623
Mortgage-backed and asset-backed	420
Total fixed-maturity investments	$ 1,772	$ 1,931