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Loans And Allowance For Credit Losses (Summary Of Outstanding Loan Balances (Accruing And Nonaccruing) Categorized By Credit Quality Indicators) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial $ 14,513 $ 14,003
Leasing 327 364
Commercial Lending Loans - Owner Occupied 7,661 7,288
Loans and Leases Receivable, Gross, Commercial, Governments 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
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,937 2,777
1-4 family residential 7,176 6,662
Loans and Leases Receivable, Gross, Consumer, Construction 643 597
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card 491 509
Loans and Leases Receivable, Gross, Consumer, Other 180 185
Loans and Leases Receivable, Gross 46,714 44,780
Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 14,513 14,003
Leasing 327 364
Commercial Lending Loans - Owner Occupied 7,661 7,288
Loans and Leases Receivable, Gross, Commercial, Governments 1,661 1,271
Loans and Leases Receivable, before Fees, Gross 24,162 22,926
Construction And Land Development [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 2,186  
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development   2,021
Term 8,939 9,103
Loans Receivable, Gross, Commercial, Real Estate 11,125 11,124
Loans and Leases Receivable, Gross 2,186 2,021
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,937 2,777
1-4 family residential 7,176 6,662
Loans and Leases Receivable, Gross, Consumer, Construction 643 597
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card 491 509
Loans and Leases Receivable, Gross, Consumer, Other 180 185
Loans and Leases Receivable, Gross 180 185
Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, before Fees, Gross 11,427 10,730
Loans and Leases Receivable, Gross 11,427 10,730
Pass [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross 45,589 42,987
Pass [Member] | Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 13,891 13,001
Leasing 313 342
Commercial Lending Loans - Owner Occupied 7,369 6,920
Loans and Leases Receivable, Gross, Commercial, Governments 1,632 1,257
Loans and Leases Receivable, before Fees, Gross 23,205 21,520
Pass [Member] | Construction And Land Development [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 2,174  
Pass [Member] | Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development   2,002
Term 8,853 8,816
Loans Receivable, Gross, Commercial, Real Estate 11,027 10,818
Pass [Member] | Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross, Consumer, Home Equity 2,920 2,759
1-4 family residential 7,129 6,602
Loans and Leases Receivable, Gross, Consumer, Construction 641 596
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card 488 507
Loans and Leases Receivable, Gross, Consumer, Other 179 185
Pass [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, before Fees, Gross 11,357 10,649
Special Mention [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross 427 660
Special Mention [Member] | Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 322 395
Leasing 10 6
Commercial Lending Loans - Owner Occupied 72 93
Loans and Leases Receivable, Gross, Commercial, Governments 2 13
Loans and Leases Receivable, before Fees, Gross 406 507
Special Mention [Member] | Construction And Land Development [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 11  
Special Mention [Member] | Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development   15
Term 10 138
Loans Receivable, Gross, Commercial, Real Estate 21 153
Special Mention [Member] | Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross, Consumer, Home Equity 0 0
1-4 family residential 0 0
Loans and Leases Receivable, Gross, Consumer, Construction 0 0
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card 0 0
Loans and Leases Receivable, Gross, Consumer, Other 0 0
Special Mention [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, before Fees, Gross 0 0
Sub-Standard [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross 698 1,132
Sub-Standard [Member] | Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 300 606
Leasing 4 16
Commercial Lending Loans - Owner Occupied 220 275
Loans and Leases Receivable, Gross, Commercial, Governments 27 1
Loans and Leases Receivable, before Fees, Gross 551 898
Sub-Standard [Member] | Construction And Land Development [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 1  
Sub-Standard [Member] | Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development   4
Term 76 149
Loans Receivable, Gross, Commercial, Real Estate 77 153
Sub-Standard [Member] | Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross, Consumer, Home Equity 17 18
1-4 family residential 47 60
Loans and Leases Receivable, Gross, Consumer, Construction 2 1
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card 3 2
Loans and Leases Receivable, Gross, Consumer, Other 1 0
Sub-Standard [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, before Fees, Gross 70 81
Doubtful [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross 0 1
Doubtful [Member] | Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Commercial and industrial 0 1
Leasing 0 0
Commercial Lending Loans - Owner Occupied 0 0
Loans and Leases Receivable, Gross, Commercial, Governments 0 0
Loans and Leases Receivable, before Fees, Gross 0 1
Doubtful [Member] | Construction And Land Development [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development 0  
Doubtful [Member] | Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction and land development   0
Term 0 0
Loans Receivable, Gross, Commercial, Real Estate 0 0
Doubtful [Member] | Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross, Consumer, Home Equity 0 0
1-4 family residential 0 0
Loans and Leases Receivable, Gross, Consumer, Construction 0 0
Loans and Leases Receivable, Gross, Consumer, Revolving, Credit Card 0 0
Loans and Leases Receivable, Gross, Consumer, Other 0 0
Doubtful [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, before Fees, Gross 0 0
Total Allowance [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross 495 518
Total Allowance [Member] | Commercial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, before Fees, Gross 331 371
Total Allowance [Member] | Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans Receivable, Gross, Commercial, Real Estate 110 103
Total Allowance [Member] | Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, before Fees, Gross   $ 44
Total Allowance [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, before Fees, Gross $ 54