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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 24,271,467	$ 21,966,803
Estimated Fair Value	$ 24,449,498	$ 23,210,968
% of Total	100.00%	100.00%
Financial Services Sector [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 8,561,885	$ 7,977,885
Estimated Fair Value	$ 8,564,254	$ 8,362,774
% of Total	35.10%	36.10%
Commercial and Industrial Sector [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 12,632,502	$ 11,535,166
Estimated Fair Value	$ 12,753,024	$ 12,199,333
% of Total	52.10%	52.50%
Utility Sector [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 3,077,080	$ 2,453,752
Estimated Fair Value	$ 3,132,220	$ 2,648,861
% of Total	12.80%	11.40%

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Percentage of available for sale securities

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