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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 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 $ 404,010  
Fixed maturity securities, available for sale, due after one year through five years, amortized cost 5,612,668  
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost 10,399,862  
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost 10,051,773  
Fixed maturity securities, available for sale, due after twenty years, amortized cost 8,490,585  
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost 34,958,898  
Fixed maturity securities, available for sale, amortized cost 48,170,556 $ 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 409,265  
Fixed maturity securities, available for sale, due after one year through five years, fair value 5,824,616  
Fixed maturity securities, available for sale, due after five years through ten years, fair value 11,063,045  
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value 11,398,510  
Fixed maturity securities, available for sale, due after twenty years, fair value 9,634,145  
Fixed maturity securities, available for sale, securities with a single maturity date, fair value 38,329,581  
Fixed maturity securities, available for sale, fair value 51,854,384 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 1,434,116  
Fixed maturity securities, available for sale, amortized cost 1,434,116 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 1,557,156  
Fixed maturity securities, available for sale, fair value 1,557,156 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 5,564,871  
Fixed maturity securities, available for sale, amortized cost 5,564,871 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 5,839,510  
Fixed maturity securities, available for sale, fair value 5,839,510 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 6,212,671  
Fixed maturity securities, available for sale, amortized cost 6,212,671 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 6,128,137  
Fixed maturity securities, available for sale, fair value $ 6,128,137 $ 5,464,329