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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 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 $ 425,542  
Fixed maturity securities, available for sale, due after one year through five years, amortized cost 6,511,972  
Fixed maturity securities, available for sale, due after five years through ten years, amortized cost 9,337,950  
Fixed maturity securities, available for sale, due after ten years through twenty years, amortized cost 9,676,298  
Fixed maturity securities, available for sale, due after twenty years, amortized cost 7,583,607  
Fixed maturity securities, available for sale, securities with a single maturity date, amortized cost 33,535,369  
Fixed maturity securities, available for sale, amortized cost 46,951,043 [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 432,132  
Fixed maturity securities, available for sale, due after one year through five years, fair value 6,869,898  
Fixed maturity securities, available for sale, due after five years through ten years, fair value 10,131,288  
Fixed maturity securities, available for sale, due after ten years through twenty years, fair value 11,429,195  
Fixed maturity securities, available for sale, due after twenty years, fair value 8,837,146  
Fixed maturity securities, available for sale, securities with a single maturity date, fair value 37,699,659  
Fixed maturity securities, available for sale, fair value 50,738,792 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 1,588,760  
Fixed maturity securities, available for sale, amortized cost 1,588,760 [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 1,712,725  
Fixed maturity securities, available for sale, fair value 1,712,725 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 5,524,081  
Fixed maturity securities, available for sale, amortized cost 5,524,081 [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 5,393,062  
Fixed maturity securities, available for sale, fair value 5,393,062 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 6,302,833  
Fixed maturity securities, available for sale, amortized cost 6,302,833 [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 5,933,346  
Fixed maturity securities, available for sale, fair value $ 5,933,346 $ 6,162,156
[1]
(1) Amortized cost excludes accrued interest receivable of $432.0 million as of June 30, 2020.