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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - Fixed Maturities [Member]
$ in Millions
Mar. 31, 2020
USD ($)
Available For Sale Securities [Abstract]  
Due in one year or less $ 476
Due after one year through five years 500
Due after five years through ten years 345
Due after ten years 729
Mortgage-Backed and Asset-Backed 721
Total Available-For-Sale, amortized cost 2,771
Due in one year or less 476
Due after one year through five years 506
Due after five years through ten years 357
Due after ten years 891
Mortgage-Backed and Asset-Backed 701
Total Available-For-Sale, fair value 2,931
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 529
Mortgage-Backed and Asset-Backed 0
Total held-to-maturity, amortized cost 529
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 572
Mortgage-Backed and Asset-Backed 0
Held-To-Maturity Securities Fair Value $ 572