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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 ($)
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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

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