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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
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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Percentage of available for sale securities

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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