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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Mortgage Loans On Real Estate Aging [Abstract]        
Mortgage loans on real estate, gross   $ 17,014    
Allowance for credit losses $ (103) (99) $ (77) $ (96)
Unamortized premium (discount) 28 28    
Mark-to-market gains (losses) (25) (27)    
Total carrying value 18,327 18,301    
Current [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Mortgage loans on real estate, gross 18,338 18,318    
30 to 59 Days Past Due [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Mortgage loans on real estate, gross 29 42    
60 to 89 Days Past Due [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Mortgage loans on real estate, gross 29 6    
90 Or More Days Past Due [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Mortgage loans on real estate, gross 31 33    
Commercial [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Mortgage loans on real estate, gross 17,019      
Allowance for credit losses (83) (84) (59) (79)
Unamortized premium (discount) (8) (8)    
Mark-to-market gains (losses) (25) (27)    
Total carrying value 16,911 16,903    
Commercial [Member] | Current [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Mortgage loans on real estate, gross 17,008 17,003    
Commercial [Member] | 30 to 59 Days Past Due [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Mortgage loans on real estate, gross   19    
Commercial [Member] | 60 to 89 Days Past Due [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Mortgage loans on real estate, gross 19      
Residential [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Mortgage loans on real estate, gross 1,436 1,413    
Allowance for credit losses (20) (15) $ (18) $ (17)
Unamortized premium (discount) 36 36    
Total carrying value 1,416 1,398    
Residential [Member] | Current [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Mortgage loans on real estate, gross 1,330 1,315    
Residential [Member] | 30 to 59 Days Past Due [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Mortgage loans on real estate, gross 29 23    
Residential [Member] | 60 to 89 Days Past Due [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Mortgage loans on real estate, gross 10 6    
Residential [Member] | 90 Or More Days Past Due [Member]        
Mortgage Loans On Real Estate Aging [Abstract]        
Mortgage loans on real estate, gross $ 31 $ 33