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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Available for sale, due in one year or less, amortized cost $ 365,686  
Available for sale, due after one year through five years, amortized cost 5,426,450  
Available for sale, due after five years through ten years, amortized cost 9,918,504  
Available for sale, due after ten years through twenty years, amortized cost 9,565,686  
Available for sale, due after twenty years, amortized cost 8,534,715  
Available for sale, securities with a single maturity date, amortized cost 33,811,041  
Available for sale securities, amortized cost 46,131,190 $ 43,116,759
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale, due in one year or less, fair value 368,836  
Available for sale, due after one year through five years, fair value 5,416,871  
Available for sale, due after five years through ten years, fair value 9,768,751  
Available for sale, due after ten years through twenty years, fair value 9,895,985  
Available for sale, due after twenty years, fair value 8,427,793  
Available for sale, securities with a single maturity date, fair value 33,878,236  
Available for sale securities, fair value 45,923,727 45,372,989
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 1,134,623  
Available for sale securities, amortized cost 1,134,623 1,028,484
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale, securities without a single maturity date, fair value 1,202,159  
Available for sale securities, fair value 1,202,159 1,105,567
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 5,492,271  
Available for sale securities, amortized cost 5,492,271 5,531,922
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale, securities without a single maturity date, fair value 5,379,003  
Available for sale securities, fair value 5,379,003 5,544,850
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 5,693,255  
Available for sale securities, amortized cost 5,693,255 3,075,975
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Available for sale, securities without a single maturity date, fair value 5,464,329  
Available for sale securities, fair value $ 5,464,329 $ 3,120,536