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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - Fixed Maturities [Member] $ in Millions | Dec. 31, 2019 USD ($)
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Available For Sale Securities [Abstract] |
Due in one year or less | $ 570
Due after one year through five years | 472
Due after five years through ten years | 391
Due after ten years | 731
Mortgage-Backed and Asset-Backed | 820
Total Available-For-Sale, amortized cost | 2,984
Due in one year or less | 571
Due after one year through five years | 480
Due after five years through ten years | 411
Due after ten years | 820
Mortgage-Backed and Asset-Backed | 817
Total Available-For-Sale, fair value | 3,099
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 | 890
Mortgage-Backed and Asset-Backed | 0
Total held-to-maturity, amortized cost | 890
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 | 892
Mortgage-Backed and Asset-Backed | 0
Held-To-Maturity Securities Fair Value | $ 892

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