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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 26,055,078 | $ 24,006,407
Estimated Fair Value | $ 27,635,431 | $ 23,982,119
% of Total | 100.00% | 100.00%
Financial Services Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 9,865,739 | $ 8,793,742
Estimated Fair Value | $ 10,385,443 | $ 8,730,568
% of Total | 37.60% | 36.30%
Commercial and Industrial Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 13,063,121 | $ 12,336,857
Estimated Fair Value | $ 13,878,056 | $ 12,342,111
% of Total | 50.20% | 51.60%
Utility Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 3,126,218 | $ 2,875,808
Estimated Fair Value | $ 3,371,932 | $ 2,909,440
% of Total | 12.20% | 12.10%

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