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Credit Quality And Allowance For Credit Losses (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Loan Interest Receivable $ 313 $ 261  
Financing Receivable, Nonaccrual, Interest Income 9 12 $ 11
Commitments to lend additional funds to TDR borrowers 0    
Financial Receivable, Troubled Debt Restructuring, Other-than-Insignificant Payment Delays 6    
Foreclosed property $ 0 $ 0  
Payment Delay      
Minimum period loan terms were extended 90 days 90 days  
Subsequent default during period $ 0 $ 6  
Interest Rate Reductions      
Minimum period loan terms were extended 90 days 90 days  
Subsequent default during period $ 0 $ 0