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Medium- And Long-Term Debt (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Real estate-related loans securing FHLB advances $ 18,600  
Pledged to the FHLB as collateral for potential future borrowings 2,400  
Potential future borrowings 11,700  
Unamortized debt issuance cost $ 8 $ 10