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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Fixed maturity securities, available for sale, due in one year or less, amortized cost $ 890,969  
Fixed maturity securities, available for sale, due after one year through five years, amortized cost 6,970,380  
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost 7,771,264  
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost 9,332,336  
Fixed maturity securities, available for sale, due after twenty years, amortized cost 6,481,165  
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost 31,446,114  
Fixed maturity securities, available for sale, amortized cost [1] 42,114,459 $ 42,304,736
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, due in one year or less, fair value 899,102  
Fixed maturity securities, available for sale, due after one year through five years, fair value 7,416,931  
Fixed maturity securities, available for sale, due after five years through ten years, fair value 8,448,559  
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value 10,859,556  
Fixed maturity securities, available for sale, due after twenty years, fair value 7,182,073  
Fixed maturity securities, available for sale, securities with a single maturity date, fair value 34,806,221  
Fixed maturity securities, available for sale, fair value 45,690,341 47,538,893
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 1,263,013  
Fixed maturity securities, available for sale, amortized cost [1] 1,263,013 1,399,956
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 1,346,473  
Fixed maturity securities, available for sale, fair value 1,346,473 1,512,831
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 4,019,810  
Fixed maturity securities, available for sale, amortized cost [1] 4,019,810 4,119,650
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 4,177,242  
Fixed maturity securities, available for sale, fair value 4,177,242 4,261,227
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 5,385,522  
Fixed maturity securities, available for sale, amortized cost [1] 5,385,522 5,593,169
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 5,360,405  
Fixed maturity securities, available for sale, fair value $ 5,360,405 $ 5,549,849
[1] Amortized cost excludes accrued interest receivable of $389.2 million and $377.5 million as of March 31, 2021 and December 31, 2020, respectively.