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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 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 $ 1,138,126  
Fixed maturity securities, available for sale, due after one year through five years, amortized cost 6,954,092  
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost 7,258,590  
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost 9,394,292  
Fixed maturity securities, available for sale, due after twenty years, amortized cost 7,223,918  
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost 31,969,018  
Fixed maturity securities, available for sale, amortized cost 41,852,088 $ 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 1,152,012  
Fixed maturity securities, available for sale, due after one year through five years, fair value 7,436,430  
Fixed maturity securities, available for sale, due after five years through ten years, fair value 8,067,610  
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value 11,392,923  
Fixed maturity securities, available for sale, due after twenty years, fair value 8,389,462  
Fixed maturity securities, available for sale, securities with a single maturity date, fair value 36,438,437  
Fixed maturity securities, available for sale, fair value 46,659,256 $ 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 1,106,921  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 1,192,423  
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 3,977,815  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 4,175,517  
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 4,798,334  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value $ 4,852,879