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