Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - Fixed Maturities [Member] - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Available For Sale Securities [Abstract]
Due in one year or less	$ 199
Due after one year through five years	280
Due after five years through ten years	332
Due after ten years	788
Mortgage-backed and asset-backed	564
Total fixed-maturity investments	2,163
Due in one year or less	197
Due after one year through five years	270
Due after five years through ten years	288
Due after ten years	652
Mortgage-backed and asset-backed	524
Total fixed-maturity investments	$ 1,931	$ 2,457