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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - Corporate Debt Securities [Member] - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 28,154,301 | $ 24,006,407
Estimated Fair Value | $ 30,353,219 | $ 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 | $ 10,604,290 | $ 8,793,742
Estimated Fair Value | $ 11,327,324 | $ 8,730,568
% of Total | 37.30% | 36.30%
Commercial and Industrial Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 14,099,496 | $ 12,336,857
Estimated Fair Value | $ 15,213,256 | $ 12,342,111
% of Total | 50.10% | 51.60%
Utility Sector [Member] |  |
Corporate Securities by Investment Sector And Credit Rating [Line Items] |  |
Amortized Cost | $ 3,450,515 | $ 2,875,808
Estimated Fair Value | $ 3,812,639 | $ 2,909,440
% of Total | 12.60% | 12.10%

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