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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 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 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 $ 3 $ 19 $ 3 $ 21 $ 123 $ 162  
Financing Receivable, Recorded Investment, Current 43,418   43,418   43,418   $ 42,340
Financing Receivable Recorded Investment Thirty To Eighty Nine Days Past Due 124   124   124   150
Financing Receivable Recorded Investments, Equal To and Greater Than 90 Days Past Due 141   141   141   159
Total past due 265   265   265   309
Loans and Leases Receivable, Gross 43,683   43,683   43,683   42,649
Accruing loans 90+ days past due 19   19   19   36
Financing Receivable, Recorded Investment, Nonaccrual Status [1] 325   325   325   381
Commercial And Industrial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 15 0 17      
Commercial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, Gross 22,203   22,203   22,203   21,615
Commercial Loan [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 3 19 3 21      
Financing Receivable, Recorded Investment, Nonaccrual Status 375   375   375   443
Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 6   6   6   7
Consumer Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, Gross 10,282   10,282   10,282   9,693
Financing Receivable, Recorded Investment, Nonaccrual Status 1   1   1   0
Consumer Loan [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 56   56   56   50
Finance Leases Portfolio Segment [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 10   10   10   14
Owner Occupied [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 3 4 3 4      
Financing Receivable, Recorded Investment, Nonaccrual Status 86   86   86   74
Municipal [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 1   1   1   1
Term [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 37   37   37   29
Commercial Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Loans and Leases Receivable, Gross 11,198   11,198   11,198   11,341
Financing Receivable, Recorded Investment, Nonaccrual Status 43   43   43   36
Home Equity Line of Credit [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 11   11   11   11
One Through Four Family Residential [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 43   43   43   36
Construction And Other Consumer Real Estate [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 1   1   1   2
Revolving Credit Facility [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Recorded Investment, Nonaccrual Status 0   0   $ 0   $ 1
Accruing [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0 0 0      
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 0 0 0      
Accruing [Member] | Owner Occupied [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 0 0 0      
Nonaccruing [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 3 19 3 21      
Nonaccruing [Member] | Commercial And Industrial [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 0 15 0 17      
Nonaccruing [Member] | Commercial Loan [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment 3 19 3 21      
Nonaccruing [Member] | Owner Occupied [Member]              
Financing Receivable, Allowance for Credit Losses [Line Items]              
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 3 $ 4 $ 3 $ 4      
[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.