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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Variable Interest Entity Primary Beneficiary [Member] |  |
Held To Maturity Securities [Abstract] |  |
Total held-to-maturity, amortized cost | $ 890 | $ 890
Held-To-Maturity Securities Fair Value | 901 | $ 916
Fixed Maturities [Member] |  |
Available For Sale Securities [Abstract] |  |
Due in one year or less | 667 |
Due after one year through five years | 1,038 |
Due after five years through ten years | 641 |
Due after ten years | 1,120 |
Mortgage-Backed and Asset-Backed | 731 |
Total Available-For-Sale, amortized cost | 4,197 |
Due in one year or less | 671 |
Due after one year through five years | 1,038 |
Due after five years through ten years | 562 |
Due after ten years | 1,151 |
Mortgage-Backed and Asset-Backed | 722 |
Total Available-For-Sale, fair value | 4,144 |
Fixed Maturities [Member] | 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 | 901 |
Mortgage-Backed and Asset-Backed | 0 |
Held-To-Maturity Securities Fair Value | $ 901 |

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