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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Mortgage Loans On Real Estate Aging [Abstract]            
Allowance for credit losses $ (105) $ (103) $ (99) $ (81) $ (77) $ (96)
Unamortized premium (discount) 32   28      
Mark-to-market gains (losses) (28)   (27)      
Total carrying value 18,460   18,301      
Current [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 18,492   18,318      
30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 20   42      
60 to 89 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 4   6      
90 Or More Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 45   33      
Commercial [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 17,014   17,014      
Allowance for credit losses (82) (83) (84) (72) (59) (79)
Unamortized premium (discount) (7)   (8)      
Mark-to-market gains (losses) (27)   (27)      
Total carrying value 16,905   16,903      
Commercial [Member] | Current [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 17,021   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      
Residential [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 1,579   1,413      
Allowance for credit losses (23) $ (20) (15) $ (9) $ (18) $ (17)
Unamortized premium (discount) 39   36      
Mark-to-market gains (losses) (1)          
Total carrying value 1,555   1,398      
Residential [Member] | Current [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 1,471   1,315      
Residential [Member] | 30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 20   23      
Residential [Member] | 60 to 89 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 4   6      
Residential [Member] | 90 Or More Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross $ 45   $ 33