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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 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 $ 1,950,504  
Fixed maturity securities, available for sale, due after one year through five years, amortized cost 7,573,038  
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost 7,230,026  
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost 10,119,850  
Fixed maturity securities, available for sale, due after twenty years, amortized cost 9,133,449  
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost 36,006,867  
Fixed maturity securities, available for sale, amortized cost 46,999,183 $ 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 1,968,323  
Fixed maturity securities, available for sale, due after one year through five years, fair value 7,962,521  
Fixed maturity securities, available for sale, due after five years through ten years, fair value 7,860,389  
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value 12,053,093  
Fixed maturity securities, available for sale, due after twenty years, fair value 10,224,400  
Fixed maturity securities, available for sale, securities with a single maturity date, fair value 40,068,726  
Fixed maturity securities, available for sale, fair value 51,305,943 $ 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 1,056,778  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 1,125,049  
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 4,708,878  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 4,840,311  
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 5,226,660  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value $ 5,271,857