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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 21,252,180 | $ 18,924,711
Estimated Fair Value | $ 22,341,661 | $ 19,619,084
% of Total | 100.00% | 100.00%
Financial Services Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 7,741,482 | $ 6,725,199
Estimated Fair Value | $ 8,077,195 | $ 6,888,968
% of Total | 36.10% | 35.20%
Commercial and Industrial Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 11,215,292 | $ 10,228,813
Estimated Fair Value | $ 11,792,664 | $ 10,639,613
% of Total | 52.90% | 54.20%
Utility Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 2,295,406 | $ 1,970,699
Estimated Fair Value | $ 2,471,802 | $ 2,090,503
% of Total | 11.00% | 10.60%

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