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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 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 $ 1,688,694  
Fixed maturity securities, available for sale, due after one year through five years, amortized cost 6,932,293  
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost 6,728,152  
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost 9,272,871  
Fixed maturity securities, available for sale, due after twenty years, amortized cost 7,086,448  
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost 31,708,458  
Fixed maturity securities, available for sale, amortized cost 41,247,540 $ 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 1,705,847  
Fixed maturity securities, available for sale, due after one year through five years, fair value 7,402,594  
Fixed maturity securities, available for sale, due after five years through ten years, fair value 7,453,463  
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value 11,196,318  
Fixed maturity securities, available for sale, due after twenty years, fair value 8,137,099  
Fixed maturity securities, available for sale, securities with a single maturity date, fair value 35,895,321  
Fixed maturity securities, available for sale, fair value 45,738,097 $ 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 980,838  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 1,053,983  
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 3,963,733  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 4,138,078  
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 4,594,511  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value $ 4,650,715