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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Variable Interest Entity Primary Beneficiary [Member] |  |
Held To Maturity Securities [Abstract] |  |
Total Held-To-Maturity, amortized cost | $ 890 | $ 2,689
Total Held-To-Maturity, fair value | 876 | $ 2,401
Fixed Maturities [Member] |  |
Available For Sale Securities [Abstract] |  |
Due in one year or less | 334 |
Due after one year through five years | 1,206 |
Due after five years through ten years | 784 |
Due after ten years | 1,327 |
Mortgage-Backed and Asset-Backed | 1,278 |
Total Available-For-Sale, amortized cost | 4,929 |
Due in one year or less | 334 |
Due after one year through five years | 1,221 |
Due after five years through ten years | 725 |
Due after ten years | 1,366 |
Mortgage-Backed and Asset-Backed | 1,263 |
Total Available-For-Sale, fair value | 4,909 |
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 | 876 |
Mortgage-Backed and Asset-Backed | 0 |
Total Held-To-Maturity, fair value | $ 876 |

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