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Loans And Allowance For Credit Losses (Summary Of Past Due Loans (Accruing And Nonaccruing)) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 1 $ 7 $ 2 $ 7 $ 84 $ 139  
Financing Receivable, Recorded Investment, Current 43,840   43,840       $ 42,340
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 122   122       150
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 194   194       159
Total past due 316   316       309
Loans and Leases Receivable, Gross 44,156   44,156       42,649
Accruing loans 90+ days past due 30   30       36
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 265   265       381
Commercial And Industrial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 1 3 1 3      
Commercial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, Gross 22,539   22,539       21,615
Commercial Loan [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 1 7 2 7      
Financing Receivable, Recorded Investment, Nonaccrual Status 351   351       443
Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 6   6       7
Consumer Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, Gross 10,503   10,503       9,693
Financing Receivable, Recorded Investment, Nonaccrual Status 1   1       0
Consumer Loan [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 54   54       50
Finance Leases Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 8   8       14
Owner Occupied [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 4 1 4      
Financing Receivable, Recorded Investment, Nonaccrual Status 85   85       74
Municipal [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 1   1       1
Term [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 41   41       29
Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, Gross 11,114   11,114       11,341
Financing Receivable, Recorded Investment, Nonaccrual Status 47   47       36
Home Equity Line of Credit [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 11   11       11
One Through Four Family Residential [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 40   40       36
Construction And Other Consumer Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 1   1       2
Revolving Credit Facility [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 1   1       $ 1
Accruing [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 4 0 4      
Accruing [Member] | Commercial And Industrial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0 0 0      
Accruing [Member] | Commercial Loan [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 4 0 4      
Accruing [Member] | Owner Occupied [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 4 0 4      
Nonaccruing [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 1 3 2 3      
Nonaccruing [Member] | Commercial And Industrial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 1 3 1 3      
Nonaccruing [Member] | Commercial Loan [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 1 3 2 3      
Nonaccruing [Member] | Owner Occupied [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 0 $ 0 $ 1 $ 0      
[1] 1 Represents nonaccrual loans that are not past due more than 30 days; however, full payment of principal and interest is still not expected.