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Loans, Leases, and Allowance for Credit Losses (Summary of Past Due Loans (Accruing and Nonaccruing)) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans $ 58,109 $ 57,779  
90+ days past due 3 3  
Nonaccrual loans that are current 248 222  
Loans and leases, net of unearned income and fees 58,109 57,779  
Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 30,479 30,588  
90+ days past due 2 2  
Nonaccrual loans that are current 132 104  
Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 13,578 13,371  
90+ days past due 0 0  
Nonaccrual loans that are current 43 61  
Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 14,052 13,820  
90+ days past due 1 1  
Nonaccrual loans that are current 73 57  
Commercial and industrial | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 16,519 16,684  
90+ days past due 2 1  
Nonaccrual loans that are current 110 82  
Leasing | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 388 383  
90+ days past due 0 0  
Nonaccrual loans that are current 2    
Owner-occupied | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 9,295 9,219  
90+ days past due 0 1  
Nonaccrual loans that are current 20 20  
Municipal | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 4,277 4,302  
90+ days past due 0 0  
Loans and leases, net of unearned income and fees 8   $ 0
Construction and land development | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 2,686 2,669  
90+ days past due 0 0  
Nonaccrual loans that are current 1 22  
Loans and leases, net of unearned income and fees 25   0
Term | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 10,892 10,702  
90+ days past due 0 0  
Nonaccrual loans that are current 42 39  
Home equity credit line | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 3,382 3,356  
90+ days past due 0 0  
Nonaccrual loans that are current 27 17  
Loans and leases, net of unearned income and fees 2   0
1-4 family residential | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 8,778 8,415  
90+ days past due 0 0  
Nonaccrual loans that are current 44 40  
Construction and other consumer real estate | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 1,321 1,442  
90+ days past due 0 0  
Bankcard and other revolving plans | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 439 474  
90+ days past due 1 1  
Nonaccrual loans that are current 1    
Other | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 132 133  
90+ days past due 0 0  
Nonaccrual loans that are current 1    
Loans and leases, net of unearned income and fees 1   0
Current      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 57,919 57,576  
Current | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 30,430 30,519  
Current | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 13,500 13,306  
Current | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 13,989 13,751  
Current | Commercial and industrial | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 16,480 16,631  
Current | Leasing | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 386 381  
Current | Owner-occupied | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 9,288 9,206  
Current | Municipal | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 4,276 4,301  
Loans and leases, net of unearned income and fees 8   0
Current | Construction and land development | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 2,682 2,645  
Loans and leases, net of unearned income and fees 23   0
Current | Term | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 10,818 10,661  
Current | Home equity credit line | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 3,361 3,334  
Loans and leases, net of unearned income and fees 2   0
Current | 1-4 family residential | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 8,740 8,375  
Current | Construction and other consumer real estate | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 1,321 1,442  
Current | Bankcard and other revolving plans | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 436 468  
Current | Other | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 131 132  
Loans and leases, net of unearned income and fees 1   0
Total past due      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 190 203  
Total past due | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 49 69  
Total past due | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 78 65  
Total past due | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 63 69  
Total past due | Commercial and industrial | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 39 53  
Total past due | Leasing | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 2 2  
Total past due | Owner-occupied | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 7 13  
Total past due | Municipal | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 1 1  
Loans and leases, net of unearned income and fees 0   0
Total past due | Construction and land development | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 4 24  
Loans and leases, net of unearned income and fees 2   0
Total past due | Term | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 74 41  
Total past due | Home equity credit line | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 21 22  
Loans and leases, net of unearned income and fees 0   0
Total past due | 1-4 family residential | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 38 40  
Total past due | Construction and other consumer real estate | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 0 0  
Total past due | Bankcard and other revolving plans | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 3 6  
Total past due | Other | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 1 1  
Loans and leases, net of unearned income and fees 0   0
30-89 days past due      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 101 108  
30-89 days past due | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 25 52  
30-89 days past due | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 47 16  
30-89 days past due | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 29 40  
30-89 days past due | Commercial and industrial | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 17 38  
30-89 days past due | Leasing | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 2 2  
30-89 days past due | Owner-occupied | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 5 11  
30-89 days past due | Municipal | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 1 1  
Loans and leases, net of unearned income and fees 0   0
30-89 days past due | Construction and land development | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 3 2  
Loans and leases, net of unearned income and fees 1   0
30-89 days past due | Term | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 44 14  
30-89 days past due | Home equity credit line | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 11 17  
Loans and leases, net of unearned income and fees 0   0
30-89 days past due | 1-4 family residential | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 15 17  
30-89 days past due | Construction and other consumer real estate | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 0 0  
30-89 days past due | Bankcard and other revolving plans | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 2 5  
30-89 days past due | Other | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 1 1  
Loans and leases, net of unearned income and fees 0   0
90+ days past due      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 89 95  
90+ days past due | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 24 17  
90+ days past due | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 31 49  
90+ days past due | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 34 29  
90+ days past due | Commercial and industrial | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 22 15  
90+ days past due | Leasing | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 0 0  
90+ days past due | Owner-occupied | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 2 2  
90+ days past due | Municipal | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 0 0  
Loans and leases, net of unearned income and fees 0   0
90+ days past due | Construction and land development | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 1 22  
Loans and leases, net of unearned income and fees 1   0
90+ days past due | Term | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 30 27  
90+ days past due | Home equity credit line | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 10 5  
Loans and leases, net of unearned income and fees 0   0
90+ days past due | 1-4 family residential | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 23 23  
90+ days past due | Construction and other consumer real estate | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 0 0  
90+ days past due | Bankcard and other revolving plans | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 1 1  
90+ days past due | Other | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Total loans 0 0  
Loans and leases, net of unearned income and fees 0   $ 0
Nonaccrual loans that are current      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Nonaccrual loans that are current 139 108  
Nonaccrual loans that are current | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Nonaccrual loans that are current 105 83  
Nonaccrual loans that are current | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Nonaccrual loans that are current 3 3  
Nonaccrual loans that are current | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Nonaccrual loans that are current 31 22  
Nonaccrual loans that are current | Commercial and industrial | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Nonaccrual loans that are current 87 65  
Nonaccrual loans that are current | Leasing | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Nonaccrual loans that are current 0 0  
Nonaccrual loans that are current | Owner-occupied | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Nonaccrual loans that are current 18 18  
Nonaccrual loans that are current | Municipal | Commercial      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Nonaccrual loans that are current 0 0  
Nonaccrual loans that are current | Construction and land development | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Nonaccrual loans that are current 0 0  
Nonaccrual loans that are current | Term | Commercial real estate      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Nonaccrual loans that are current 3 3  
Nonaccrual loans that are current | Home equity credit line | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Nonaccrual loans that are current 14 9  
Nonaccrual loans that are current | 1-4 family residential | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Nonaccrual loans that are current 16 13  
Nonaccrual loans that are current | Construction and other consumer real estate | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Nonaccrual loans that are current 0 0  
Nonaccrual loans that are current | Bankcard and other revolving plans | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Nonaccrual loans that are current 0 0  
Nonaccrual loans that are current | Other | Consumer      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Nonaccrual loans that are current $ 1 $ 0