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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 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 $ 1,285,124  
Fixed maturity securities, available for sale, due after one year through five years, amortized cost 8,050,284  
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost 7,228,862  
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost 10,741,247  
Fixed maturity securities, available for sale, due after twenty years, amortized cost 10,551,772  
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost 37,857,289  
Fixed maturity securities, available for sale, amortized cost 49,364,915 $ 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 1,294,473  
Fixed maturity securities, available for sale, due after one year through five years, fair value 8,089,245  
Fixed maturity securities, available for sale, due after five years through ten years, fair value 7,278,595  
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value 11,453,442  
Fixed maturity securities, available for sale, due after twenty years, fair value 10,188,959  
Fixed maturity securities, available for sale, securities with a single maturity date, fair value 38,304,714  
Fixed maturity securities, available for sale, fair value 49,662,120 $ 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 1,195,436  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 1,210,559  
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 4,873,980  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 4,769,867  
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 5,438,210  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value $ 5,376,980