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Investments (Composition Of Current And Past Due Mortgage Loans On Real Estate) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross     $ 17,171      
Allowance for credit losses $ (81) $ (77) (96) $ (170) $ (184) $ (204)
Unamortized premium (discount) 21   16      
Mark-to-market gains (losses) (20)   (3)      
Total carrying value 17,922   17,991      
Current [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 17,648   18,004      
30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 326   36      
60 to 89 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 3   5      
90 Or More Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 25   29      
Commercial [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 16,886          
Allowance for credit losses (72) (59) (79) (156) (172) (187)
Unamortized premium (discount) (10)   (11)      
Mark-to-market gains (losses) (20)   (3)      
Total carrying value 16,794   17,089      
Commercial [Member] | Current [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 16,593   17,167      
Commercial [Member] | 30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 303   15      
Residential [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 1,137   919      
Allowance for credit losses (9) $ (18) (17) $ (14) $ (12) $ (17)
Unamortized premium (discount) 31   27      
Total carrying value 1,128   902      
Residential [Member] | Current [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 1,055   837      
Residential [Member] | 30 to 59 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 23   21      
Residential [Member] | 60 to 89 Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross 3   5      
Residential [Member] | 90 Or More Days Past Due [Member]            
Mortgage Loans On Real Estate Aging [Abstract]            
Mortgage loans on real estate, gross $ 25   $ 29