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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, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held for sale $ 129 $ 93
Owner occupied 7,901 7,661
Construction and land development 2,211 2,186
Term 9,344 8,939
Loans and Leases Receivable, Gross 48,709 46,714
Loans Credit Quality Outstanding, Commercial And Industrial 14,760 14,513
Loan Credit Quality Outstanding, Leasing 334 327
Loans Credit Quality Outstanding, Municipal 2,393 1,661
Loans Credit Quality Outstanding, Home Equity Credit Line 2,917 2,937
Loans Credit Quality Outstanding, 1-4 Family Residential 7,568 7,176
Loans Credit Quality Outstanding, Construction and Other 624 643
Loans Credit Quality Outstanding, Other 155 180
Loans and Leases Receivable, Deferred Income 48 50
Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, before Fees, Gross 25,388 24,162
Consumer Loan [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, before Fees, Gross 11,766 11,427
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, before Fees, Gross $ 11,555 $ 11,125