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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Fixed maturity securities, available for sale, due in one year or less, amortized cost $ 372,763  
Fixed maturity securities, available for sale, due after one year through five years, amortized cost 5,629,851  
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost 10,015,444  
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost 9,853,081  
Fixed maturity securities, available for sale, due after twenty years, amortized cost 8,462,051  
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost 34,333,190  
Fixed maturity securities, available for sale, amortized cost 46,727,050 $ 46,131,190
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, due in one year or less, fair value 375,768  
Fixed maturity securities, available for sale, due after one year through five years, fair value 5,733,881  
Fixed maturity securities, available for sale, due after five years through ten years, fair value 10,199,974  
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value 10,534,563  
Fixed maturity securities, available for sale, due after twenty years, fair value 8,779,440  
Fixed maturity securities, available for sale, securities with a single maturity date, fair value 35,623,626  
Fixed maturity securities, available for sale, fair value 48,037,107 45,923,727
Residential Mortgage Backed Securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, amortized cost 1,116,718  
Fixed maturity securities, available for sale, amortized cost 1,116,718 1,134,623
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 1,201,332  
Fixed maturity securities, available for sale, fair value 1,201,332 1,202,159
Commercial Mortgage Backed Securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, amortized cost 5,493,082  
Fixed maturity securities, available for sale, amortized cost 5,493,082 5,492,271
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 5,543,512  
Fixed maturity securities, available for sale, fair value 5,543,512 5,379,003
Other Asset Backed Securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, amortized cost 5,784,060  
Fixed maturity securities, available for sale, amortized cost 5,784,060 5,693,255
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 5,668,637  
Fixed maturity securities, available for sale, fair value $ 5,668,637 $ 5,464,329