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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Mortgage Loans On Real Estate Aging [Abstract]            
Allowance for credit losses $ (113) $ (104) $ (98) $ (91) $ (81) $ (95)
Unamortized premium (discount) 33   27      
Mark-to-market gains (losses) (26)   (27)      
Total carrying value 18,661   18,211      
Financial Asset Not Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 18,686   18,228      
30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 24   42      
60 to 89 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 13   6      
90 Or More Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 44   33      
Commercial [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 17,124   16,923      
Allowance for credit losses (89) (81) (83) (80) (72) (78)
Unamortized premium (discount) (7)   (9)      
Mark-to-market gains (losses) (27)   (27)      
Total carrying value 17,008   16,813      
Commercial [Member] | Financial Asset Not Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 17,131   16,913      
Commercial [Member] | 30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages     19      
Residential [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 1,676   1,413      
Allowance for credit losses (24) $ (23) (15) $ (11) $ (9) $ (17)
Unamortized premium (discount) 40   36      
Mark-to-market gains (losses) 1          
Total carrying value 1,653   1,398      
Residential [Member] | Financial Asset Not Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 1,555   1,315      
Residential [Member] | 30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 24   23      
Residential [Member] | 60 to 89 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages 13   6      
Residential [Member] | 90 Or More Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Carrying amount of mortgages $ 44   $ 33