Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - Fixed Maturities [Member] - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Available For Sale Securities [Abstract]
Due in one year or less	$ 349
Due after one year through five years	354
Due after five years through ten years	392
Due after ten years	901
Mortgage-Backed and Asset-Backed	628
Total Available-For-Sale, amortized cost	2,624
Due in one year or less	349
Due after one year through five years	345
Due after five years through ten years	358
Due after ten years	815
Mortgage-Backed and Asset-Backed	598
Total Available-For-Sale, fair value	$ 2,465	$ 2,457