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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Available for sale, due in one year or less, amortized cost $ 496,563  
Available for sale, due after one year through five years, amortized cost 7,229,621  
Available for sale, due after five years through ten years, amortized cost 8,167,106  
Available for sale, due after ten years through twenty years, amortized cost 9,254,579  
Available for sale, due after twenty years, amortized cost 6,044,092  
Available for sale, securities with a single maturity date, amortized cost 31,191,961  
Available for sale securities, amortized cost 42,304,736 [1] $ 48,238,946
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale, due in one year or less, fair value 505,387  
Available for sale, due after one year through five years, fair value 7,718,178  
Available for sale, due after five years through ten years, fair value 9,166,066  
Available for sale, due after ten years through twenty years, fair value 11,396,733  
Available for sale, due after twenty years, fair value 7,428,622  
Available for sale, securities with a single maturity date, fair value 36,214,986  
Fixed maturity securities, available for sale, fair value 47,538,893 51,580,490
Residential Mortgage Backed Securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Available for sale, securities without a single maturity date, amortized cost 1,399,956  
Available for sale securities, amortized cost 1,399,956 [1] 1,477,738
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale, securities without a single maturity date, fair value 1,512,831  
Fixed maturity securities, available for sale, fair value 1,512,831 1,575,664
Commercial Mortgage Backed Securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Available for sale, securities without a single maturity date, amortized cost 4,119,650  
Available for sale securities, amortized cost 4,119,650 [1] 5,591,167
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale, securities without a single maturity date, fair value 4,261,227  
Fixed maturity securities, available for sale, fair value 4,261,227 5,786,279
Other Asset Backed Securities    
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Available for sale, securities without a single maturity date, amortized cost 5,593,169  
Available for sale securities, amortized cost 5,593,169 [1] 6,250,369
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale, securities without a single maturity date, fair value 5,549,849  
Fixed maturity securities, available for sale, fair value $ 5,549,849 $ 6,162,156
[1] (1) Amortized cost excludes accrued interest receivable of $377.5 million as of December 31, 2020.