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Investments (Amortized Cost Of Mortgage Loans On Real Estate On Nonaccrual Status) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Jan. 01, 2020
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with no ACL
Nonaccrual 71 17
Commercial [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with no ACL
Residential [Member]    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual with no ACL
Nonaccrual $ 71 $ 17