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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 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 $ 306,324  
Fixed maturity securities, available for sale, due after one year through five years, amortized cost 5,806,384  
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost 10,032,375  
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost 9,994,917  
Fixed maturity securities, available for sale, due after twenty years, amortized cost 8,481,029  
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost 34,621,029  
Fixed maturity securities, available for sale, amortized cost 47,477,956 $ 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 309,641  
Fixed maturity securities, available for sale, due after one year through five years, fair value 6,000,221  
Fixed maturity securities, available for sale, due after five years through ten years, fair value 10,529,772  
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value 11,017,627  
Fixed maturity securities, available for sale, due after twenty years, fair value 9,214,691  
Fixed maturity securities, available for sale, securities with a single maturity date, fair value 37,071,952  
Fixed maturity securities, available for sale, fair value 50,171,303 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 1,232,918  
Fixed maturity securities, available for sale, amortized cost 1,232,918 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 1,338,946  
Fixed maturity securities, available for sale, fair value 1,338,946 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 5,483,813  
Fixed maturity securities, available for sale, amortized cost 5,483,813 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 5,673,990  
Fixed maturity securities, available for sale, fair value 5,673,990 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 6,140,196  
Fixed maturity securities, available for sale, amortized cost 6,140,196 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 6,086,415  
Fixed maturity securities, available for sale, fair value $ 6,086,415 $ 5,464,329