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Loans And Allowance For Credit Losses (Summary Of Major Portfolio Segment And Specific Loan Class) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for sale $ 44 $ 172
Commercial and industrial 14,003 13,452
Leasing 364 423
Owner occupied 7,288 6,962
Municipal 1,271 778
Construction and land development 2,021 2,019
Term 9,103 9,322
Loans Receivable, Gross, Commercial, Real Estate 11,124 11,341
Home equity credit line 2,777 2,645
1-4 family residential 6,662 5,891
Construction and other consumer real estate 597 486
Bankcard and other revolving plans 509 481
Other 185 190
Loans and Leases Receivable, Gross 44,780 42,649
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, before Fees, Gross 22,926 21,615
Consumer Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, before Fees, Gross $ 10,730 $ 9,693