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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 24,006,407 | $ 21,966,803
Available-for-sale Securities | $ 23,982,119 | $ 23,210,968
Percentage Of Total Available For Sales Securities | 100.00% | 100.00%
Financial Services Sector [Member] |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 8,793,742 | $ 7,977,885
Available-for-sale Securities | $ 8,730,568 | $ 8,362,774
Percentage Of Total Available For Sales Securities | 36.30% | 36.10%
Commercial and Industrial Sector [Member] |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 12,336,857 | $ 11,535,166
Available-for-sale Securities | $ 12,342,111 | $ 12,199,333
Percentage Of Total Available For Sales Securities | 51.60% | 52.50%
Utility Industry [Member] |  |
Corporate Secturities by Investment Sector And Credit Rating [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 2,875,808 | $ 2,453,752
Available-for-sale Securities | $ 2,909,440 | $ 2,648,861
Percentage Of Total Available For Sales Securities | 12.10% | 11.40%

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