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Loans And Allowance For Credit Losses (Schedule Of Investment Of Accruing And Nonaccruing Loans Modified As Troubled Debt Restructurings) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 3 $ 19 $ 3 $ 21 $ 123 $ 162
Accruing [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0 0 0    
Nonaccruing [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 3 19 3 21    
Commercial And Industrial [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 15 0 17    
Commercial And Industrial [Member] | Accruing [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0 0 0    
Commercial And Industrial [Member] | Nonaccruing [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 15 0 17    
Owner Occupied [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 3 4 3 4    
Owner Occupied [Member] | Accruing [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0 0 0    
Owner Occupied [Member] | Nonaccruing [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 3 4 3 4    
Commercial Loan [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 3 19 3 21    
Commercial Loan [Member] | Accruing [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0 0 0    
Commercial Loan [Member] | Nonaccruing [Member]            
Financing Receivable, Modifications [Line Items]            
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 3 $ 19 $ 3 $ 21