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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, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for sale $ 93 $ 44
Commercial and industrial 14,513 14,003
Leasing 327 364
Owner occupied 7,661 7,288
Municipal 1,661 1,271
Construction and land development 2,186 2,021
Term 8,939 9,103
Loans Receivable, Gross, Commercial, Real Estate 11,125 11,124
Home equity credit line 2,937 2,777
1-4 family residential 7,176 6,662
Construction and other consumer real estate 643 597
Bankcard and other revolving plans 491 509
Other 180 185
Loans and Leases Receivable, Gross 46,714 44,780
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, before Fees, Gross 24,162 22,926
Consumer Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, before Fees, Gross $ 11,427 $ 10,730