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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Mortgage Loans On Real Estate Aging [Abstract]            
Allowance for credit losses $ (81) $ (77) $ (95) $ (169) $ (183) $ (203)
Unamortized premium (discount) 21   16      
Mark-to-market gains (losses) (20)   (3)      
Total carrying value 17,830   17,893      
Financial Asset Not Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 17,556   17,905      
30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 326   36      
60 to 89 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 3   5      
90 Or More Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 25   29      
Commercial [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 16,794   17,072      
Allowance for credit losses (72) (59) (78) (155) (171) (186)
Unamortized premium (discount) (10)   (11)      
Mark-to-market gains (losses) (20)   (3)      
Total carrying value 16,702   16,991      
Commercial [Member] | Financial Asset Not Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 16,501   17,068      
Commercial [Member] | 30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 303   15      
Residential [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 1,137   919      
Allowance for credit losses (9) $ (18) (17) $ (14) $ (12) $ (17)
Unamortized premium (discount) 31   27      
Total carrying value 1,128   902      
Residential [Member] | Financial Asset Not Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 1,055   837      
Residential [Member] | 30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 23   21      
Residential [Member] | 60 to 89 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 3   5      
Residential [Member] | 90 Or More Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages $ 25   $ 29