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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 22,249,964	$ 21,966,803
Estimated Fair Value	$ 22,503,507	$ 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	$ 8,097,947	$ 7,977,885
Estimated Fair Value	$ 8,129,125	$ 8,362,774
% of Total	36.20%	36.10%
Commercial and Industrial Sector [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 11,705,150	$ 11,535,166
Estimated Fair Value	$ 11,847,762	$ 12,199,333
% of Total	52.60%	52.50%
Utility Sector [Member]
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 2,446,867	$ 2,453,752
Estimated Fair Value	$ 2,526,620	$ 2,648,861
% of Total	11.20%	11.40%

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