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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 24,216,876 | $ 24,006,407
Estimated Fair Value | $ 25,077,338 | $ 23,982,119
% of Total | 100.00% | 100.00%
Finance |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 8,981,541 | $ 8,793,742
Estimated Fair Value | $ 9,249,273 | $ 8,730,568
% of Total | 36.90% | 36.30%
Industrial |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 12,316,131 | $ 12,336,857
Estimated Fair Value | $ 12,759,526 | $ 12,342,111
% of Total | 50.90% | 51.60%
Utility |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 2,919,204 | $ 2,875,808
Estimated Fair Value | $ 3,068,539 | $ 2,909,440
% of Total | 12.20% | 12.10%

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