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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Fixed maturity securities, available for sale, due in one year or less, amortized cost $ 387,348  
Fixed maturity securities, available for sale, due after one year through five years, amortized cost 5,969,737  
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost 9,922,493  
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost 9,691,164  
Fixed maturity securities, available for sale, due after twenty years, amortized cost 7,783,150  
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost 33,753,892  
Fixed maturity securities, available for sale, amortized cost 47,254,063 [1] $ 48,238,946
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, due in one year or less, fair value 389,729  
Fixed maturity securities, available for sale, due after one year through five years, fair value 5,968,168  
Fixed maturity securities, available for sale, due after five years through ten years, fair value 10,073,950  
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value 10,713,363  
Fixed maturity securities, available for sale, due after twenty years, fair value 8,331,477  
Fixed maturity securities, available for sale, securities with a single maturity date, fair value 35,476,687  
Fixed maturity securities, available for sale, fair value 47,704,867 51,580,490
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 1,671,466  
Fixed maturity securities, available for sale, amortized cost 1,671,466 [1] 1,477,738
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 1,765,033  
Fixed maturity securities, available for sale, fair value 1,765,033 1,575,664
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 5,540,607  
Fixed maturity securities, available for sale, amortized cost 5,540,607 [1] 5,591,167
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 5,296,112  
Fixed maturity securities, available for sale, fair value 5,296,112 5,786,279
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 6,288,098  
Fixed maturity securities, available for sale, amortized cost 6,288,098 [1] 6,250,369
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Fixed maturity securities, available for sale, securities without a single maturity date, fair value 5,167,035  
Fixed maturity securities, available for sale, fair value $ 5,167,035 $ 6,162,156
[1]
(1) Amortized cost excludes accrued interest receivable of $456.1 million as of March 31, 2020.