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Investments (Amortized Cost and Fair Value of Fixed Maturity Holdings by Industry Type) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost $ 17,926,454 $ 17,575,507
Estimated Fair Value $ 18,512,048 $ 17,708,156
% of Total 100.00% 100.00%
Finance    
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost $ 5,818,427 $ 5,408,791
Estimated Fair Value $ 6,026,229 $ 5,555,044
% of Total 32.60% 31.40%
Industrial    
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost $ 10,147,913 $ 10,211,426
Estimated Fair Value $ 10,396,101 $ 10,129,917
% of Total 56.10% 57.20%
Utility    
Corporate Securities by Investment Sector And Credit Rating [Line Items]    
Amortized Cost $ 1,960,114 $ 1,955,290
Estimated Fair Value $ 2,089,718 $ 2,023,195
% of Total 11.30% 11.40%