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Investments (Distribution By Contractual Maturity Of Available-For-Sale and Held-To-Maturity Investments) (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Available For Sale Securities [Abstract] |  |
Total Available-For-Sale, Amortized Cost | $ 6,443 | $ 6,122
Total available-for-sale, fair value | 6,377 | 6,221
Held To Maturity Securities [Abstract] |  |
Total Held-To-Maturity, Amortized Cost | 2,809 | 2,829
Total held-to- maturity, fair value | 2,566 | 2,674
Fixed Maturities [Member] |  |
Available For Sale Securities [Abstract] |  |
Due in one year or less | 551 |
Due after one year through five years | 913 |
Due after five years through ten years | 926 |
Due after ten years | 1,576 |
Mortgage-Backed and Asset-Backed | 1,401 |
Total Available-For-Sale, Amortized Cost | 5,367 | 4,883
Due in one year or less | 552 |
Due after one year through five years | 929 |
Due after five years through ten years | 925 |
Due after ten years | 1,564 |
Mortgage-Backed and Asset-Backed | 1,330 |
Total available-for-sale, fair value | 5,300 | 4,993
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 | 2,809 |
Mortgage-Backed and Asset-Backed | 0 |
Total Held-To-Maturity, Amortized Cost | 2,809 |
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 | 2,566 |
Mortgage-Backed and Asset-Backed | 0 |
Total held-to- maturity, fair value | $ 2,566 |

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