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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Available for sale, due in one year or less, amortized cost $ 290,310  
Available for sale, due after one year through five years, amortized cost 5,831,134  
Available for sale, due after five years through ten years, amortized cost 10,199,288  
Available for sale, due after ten years through twenty years, amortized cost 10,519,078  
Available for sale, due after twenty years, amortized cost 8,079,862  
Available for sale, securities with a single maturity date, amortized cost 34,919,672  
Available for sale securities, amortized cost 48,238,946 $ 46,131,190
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale, due in one year or less, fair value 294,212  
Available for sale, due after one year through five years, fair value 6,061,370  
Available for sale, due after five years through ten years, fair value 10,829,871  
Available for sale, due after ten years through twenty years, fair value 11,812,300  
Available for sale, due after twenty years, fair value 9,058,638  
Available for sale, securities with a single maturity date, fair value 38,056,391  
Available for sale securities, fair value 51,580,490 45,923,727
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 1,477,738  
Available for sale securities, amortized cost 1,477,738 1,134,623
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale, securities without a single maturity date, fair value 1,575,664  
Available for sale securities, fair value 1,575,664 1,202,159
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 5,591,167  
Available for sale securities, amortized cost 5,591,167 5,492,271
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale, securities without a single maturity date, fair value 5,786,279  
Available for sale securities, fair value 5,786,279 5,379,003
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 6,250,369  
Available for sale securities, amortized cost 6,250,369 5,693,255
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale, securities without a single maturity date, fair value 6,162,156  
Available for sale securities, fair value $ 6,162,156 $ 5,464,329