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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 18,417,375 | $ 17,575,507
Estimated Fair Value | $ 19,543,237 | $ 17,708,156
% of Total | 100.00% | 100.00%
Financial Services Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 6,268,530 | $ 5,408,791
Estimated Fair Value | $ 6,577,989 | $ 5,555,044
% of Total | 33.80% | 31.40%
Commercial and Industrial Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 10,192,465 | $ 10,211,426
Estimated Fair Value | $ 10,811,758 | $ 10,129,917
% of Total | 55.20% | 57.20%
Utility Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 1,956,380 | $ 1,955,290
Estimated Fair Value | $ 2,153,490 | $ 2,023,195
% of Total | 11.00% | 11.40%

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