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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, 2014 | Dec. 31, 2013
--- | --- | ---
Held To Maturity Securities [Abstract] |  |
Total Held-To-Maturity, amortized cost | $ 2,772 | $ 2,801
Total Held-To-Maturity, fair value | 2,730 | 2,651
Fixed Maturities [Member] |  |
Available For Sale Securities [Abstract] |  |
Due in one year or less | 634 |
Due after one year through five years | 1,509 |
Due after five years through ten years | 963 |
Due after ten years | 1,483 |
Mortgage-Backed and Asset-Backed | 1,544 |
Total Available-For-Sale, amortized cost | 6,133 |
Due in one year or less | 635 |
Due after one year through five years | 1,528 |
Due after five years through ten years | 979 |
Due after ten years | 1,478 |
Mortgage-Backed and Asset-Backed | 1,512 |
Total Available-For-Sale, fair value | 6,132 |
Fixed Maturities [Member] | Variable Interest Entity Primary Beneficiary [Member] |  |
Held To Maturity Securities [Abstract] |  |
Due after ten years | 2,772 |
Total Held-To-Maturity, amortized cost | 2,772 |
Due after ten years | 2,730 |
Total Held-To-Maturity, fair value | $ 2,730 |

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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth rolling twelve months through the tenth rolling twelve months following the latest balance sheet presented. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References No definition available. + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second rolling twelve months through the fifth rolling twelve months following the latest balance sheet presented. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References No definition available. + Details
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