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Medium- And Long-Term Debt (Narrative) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Federal Home Loan Bank, Advances, Weighted Average Interest Rate 0.22%  
Real estate-related loans securing FHLB advances $ 19,000  
Pledged to the FHLB as collateral for potential future borrowings 4,800  
Long-term Federal Home Loan Bank Advances 2,800  
Potential future borrowings 11,700  
Unamortized debt issuance cost $ 10 $ 12
Subsidiaries | Floating-rate based on FHLB auction rate due 2026    
Debt Instrument [Line Items]    
Weighted-average interest rate 0.22%