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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Fixed maturity securities, available for sale, due in one year or less, amortized cost $ 1,686,367  
Fixed maturity securities, available for sale, due after one year through five years, amortized cost 7,352,839  
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost 6,868,184  
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost 11,135,170  
Fixed maturity securities, available for sale, due after twenty years, amortized cost 10,872,462  
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost 37,915,022  
Fixed maturity securities, available for sale, amortized cost 48,468,027 $ 46,999,183
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, due in one year or less, fair value 1,686,971  
Fixed maturity securities, available for sale, due after one year through five years, fair value 7,220,079  
Fixed maturity securities, available for sale, due after five years through ten years, fair value 6,538,477  
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value 10,777,240  
Fixed maturity securities, available for sale, due after twenty years, fair value 9,150,249  
Fixed maturity securities, available for sale, securities with a single maturity date, fair value 35,373,016  
Fixed maturity securities, available for sale, fair value 45,323,775 $ 51,305,943
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 1,425,997  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 1,391,707  
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 4,442,850  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 4,188,392  
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 4,684,158  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value $ 4,370,660