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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 16,000,887 | $ 14,010,604
Estimated Fair Value | $ 16,489,406 | $ 14,885,583
% of Total | 100.00% | 100.00%
Finance |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 5,238,400 | $ 4,789,568
Estimated Fair Value | $ 5,419,421 | $ 5,066,408
% of Total | 32.90% | 34.00%
Industrial |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 9,057,282 | $ 7,639,330
Estimated Fair Value | $ 9,281,262 | $ 8,086,067
% of Total | 56.20% | 54.30%
Utility |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 1,705,205 | $ 1,581,706
Estimated Fair Value | $ 1,788,723 | $ 1,733,108
% of Total | 10.90% | 11.70%

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