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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 22,249,964 | $ 21,966,803
Estimated Fair Value | $ 22,503,507 | $ 23,210,968
% of Total | 100.00% | 100.00%
Financial Services Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 8,097,947 | $ 7,977,885
Estimated Fair Value | $ 8,129,125 | $ 8,362,774
% of Total | 36.20% | 36.10%
Commercial and Industrial Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 11,705,150 | $ 11,535,166
Estimated Fair Value | $ 11,847,762 | $ 12,199,333
% of Total | 52.60% | 52.50%
Utility Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 2,446,867 | $ 2,453,752
Estimated Fair Value | $ 2,526,620 | $ 2,648,861
% of Total | 11.20% | 11.40%

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