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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 15,801,362	$ 14,010,604
Estimated Fair Value	$ 16,173,447	$ 14,885,583
% of Total	100.00%	100.00%
Finance
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 5,092,474	$ 4,789,568
Estimated Fair Value	$ 5,279,879	$ 5,066,408
% of Total	32.70%	34.00%
Industrial
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 9,004,544	$ 7,639,330
Estimated Fair Value	$ 9,099,228	$ 8,086,067
% of Total	56.20%	54.30%
Utility
Corporate Securities by Investment Sector And Credit Rating [Line Items]
Amortized Cost	$ 1,704,344	$ 1,581,706
Estimated Fair Value	$ 1,794,340	$ 1,733,108
% of Total	11.10%	11.70%

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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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