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Medium- And Long-Term Debt (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Real estate-related loans securing FHLB advances $ 18,300  
Potential future borrowings 10,200  
Unamortized debt issuance costs 7 $ 10
Subsidiaries    
Debt Instrument [Line Items]    
Long-term Federal Home Loan Bank advances 0 2,800
Floating-rate based on FHLB auction rate due 2026 | Subsidiaries    
Debt Instrument [Line Items]    
Long-term Federal Home Loan Bank advances $ 0 $ 2,800