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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross     $ 17,171      
Allowance for credit losses $ (91) $ (81) (96) $ (131) $ (170) $ (204)
Unamortized premium (discount) 25   16      
Mark-to-market gains (losses) (21)   (3)      
Total carrying value 18,066   17,991      
Current [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 18,108   18,004      
30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 12   36      
60 to 89 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 5   5      
90 Or More Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 28   29      
Commercial [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 16,885          
Allowance for credit losses (80) (72) (79) (115) (156) (187)
Unamortized premium (discount) (9)   (11)      
Mark-to-market gains (losses) (21)   (3)      
Total carrying value 16,784   17,089      
Commercial [Member] | Current [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 16,894   17,167      
Commercial [Member] | 30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross     15      
Residential [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 1,293   919      
Allowance for credit losses (11) $ (9) (17) $ (16) $ (14) $ (17)
Unamortized premium (discount) 34   27      
Total carrying value 1,282   902      
Residential [Member] | Current [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 1,214   837      
Residential [Member] | 30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 12   21      
Residential [Member] | 60 to 89 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 5   5      
Residential [Member] | 90 Or More Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross $ 28   $ 29