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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Mortgage Loans On Real Estate Aging [Abstract]        
Current $ 13,198 $ 10,662    
60 to 90 days past due 1      
Greater than 90 days past due   3    
Valuation allowance   (3) $ (2) $ (2)
Unamortized premium (discount) (9)      
Total carrying value 13,190 10,662    
Commercial [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Current 12,959 10,662    
Greater than 90 days past due   3    
Valuation allowance   (3)    
Unamortized premium (discount) (17)      
Total carrying value 12,942 $ 10,662    
Residential [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Current 239      
60 to 90 days past due 1      
Unamortized premium (discount) 8      
Total carrying value $ 248