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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mortgage Loans On Real Estate Aging [Abstract]        
Allowance for credit losses $ (98) $ (95) $ (203) $ (2)
Unamortized premium (discount) 27 16    
Mark-to-market gains (losses) (27) (3)    
Total carrying value 18,211 17,893    
Financial Asset Not Past Due [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Carrying amount of mortgages 18,228 17,905    
30 to 59 Days Past Due [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Carrying amount of mortgages 42 36    
60 to 89 Days Past Due [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Carrying amount of mortgages 6 5    
90 Or More Days Past Due [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Carrying amount of mortgages 33 29    
Commercial [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Carrying amount of mortgages 16,923 17,072    
Allowance for credit losses (83) (78) (186)  
Unamortized premium (discount) (9) (11)    
Mark-to-market gains (losses) (27) (3)    
Total carrying value 16,813 16,991    
Commercial [Member] | Financial Asset Not Past Due [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Carrying amount of mortgages 16,913 17,068    
Commercial [Member] | 30 to 59 Days Past Due [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Carrying amount of mortgages 19 15    
Residential [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Carrying amount of mortgages 1,413 919    
Allowance for credit losses (15) (17) $ (17) $ (2)
Unamortized premium (discount) 36 27    
Total carrying value 1,398 902    
Residential [Member] | Financial Asset Not Past Due [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Carrying amount of mortgages 1,315 837    
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 6 5    
Residential [Member] | 90 Or More Days Past Due [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Carrying amount of mortgages $ 33 $ 29