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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - Fixed Maturities [Member] $ in Millions | Sep. 30, 2019 USD ($)
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Available For Sale Securities [Abstract] |
Due in one year or less | $ 598
Due after one year through five years | 496
Due after five years through ten years | 436
Due after ten years | 729
Mortgage-Backed and Asset-Backed | 749
Total Available-For-Sale, amortized cost | 3,008
Due in one year or less | 599
Due after one year through five years | 503
Due after five years through ten years | 423
Due after ten years | 840
Mortgage-Backed and Asset-Backed | 748
Total Available-For-Sale, fair value | 3,113
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 | 977
Mortgage-Backed and Asset-Backed | 0
Held-To-Maturity Securities Fair Value | $ 977

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