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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - Fixed Maturities [Member]
$ in Millions
Jun. 30, 2020
USD ($)
Available For Sale Securities [Abstract]  
Due in one year or less $ 377
Due after one year through five years 477
Due after five years through ten years 304
Due after ten years 714
Mortgage-Backed and Asset-Backed 586
Total Available-For-Sale, amortized cost 2,458
Due in one year or less 378
Due after one year through five years 498
Due after five years through ten years 334
Due after ten years 857
Mortgage-Backed and Asset-Backed 585
Total Available-For-Sale, fair value 2,652
Variable Interest Entity Primary Beneficiary [Member]  
Held To Maturity Securities [Abstract]  
Due in one year or less 0
Due after one year through five years 0
Due after five years through ten years 0
Due after ten years 552
Mortgage-Backed and Asset-Backed 0
Total held-to-maturity, amortized cost 552
Due in one year or less 0
Due after one year through five years 0
Due after five years through ten years 0
Due after ten years 574
Mortgage-Backed and Asset-Backed 0
Held-To-Maturity Securities Fair Value $ 574