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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Mortgage Loans On Real Estate Aging [Abstract]            
Allowance for credit losses $ (169) $ (183) $ (203) $ (271) $ (160) $ (2)
Unamortized premium (discount) 11   8      
Mark-to-market gains (losses) (5)   (5)      
Total carrying value 17,487   16,681      
Financial Asset Not Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 17,553   16,772      
30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 50   32      
60 to 89 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 7   8      
90 Or More Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 40   69      
Commercial [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 16,899   16,152      
Allowance for credit losses (155) (171) (186) (234) (125)  
Unamortized premium (discount) (12)   (14)      
Mark-to-market gains (losses) (5)   (5)      
Total carrying value 16,739   15,961      
Commercial [Member] | Financial Asset Not Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 16,879   16,162      
Commercial [Member] | 30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 32   4      
Residential [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 762   737      
Allowance for credit losses (14) $ (12) (17) $ (37) $ (35) $ (2)
Unamortized premium (discount) 23   22      
Total carrying value 748   720      
Residential [Member] | Financial Asset Not Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 674   610      
Residential [Member] | 30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 18   28      
Residential [Member] | 60 to 89 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 7   8      
Residential [Member] | 90 Or More Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages $ 40   $ 69