v3.26.3
LOANS, LEASES, AND ALLOWANCE FOR CREDIT LOSSES (Summary of Past Due Loans (Accruing and Nonaccruing)) (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans $ 62,472 $ 60,900
90+ days past due 5 5
Nonaccrual loans that are current 311 315
Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 32,410 31,679
90+ days past due 3 3
Nonaccrual loans that are current 176 146
Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 18,758 18,111
90+ days past due 2 2
Nonaccrual loans that are current 130 93
Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 9,357 9,274
90+ days past due 1 1
Nonaccrual loans that are current 46 51
Commercial: | Municipal    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 4,295 4,294
90+ days past due 0 0
Nonaccrual loans that are current   2
Commercial real estate:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 14,155 13,396
90+ days past due 1 1
Nonaccrual loans that are current   73
Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 11,747 11,234
90+ days past due 1 1
Nonaccrual loans that are current 40 72
Commercial real estate: | Construction and land development    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 2,408 2,162
90+ days past due 0 0
Nonaccrual loans that are current   1
Consumer:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 15,907 15,825
90+ days past due 1 1
Nonaccrual loans that are current 95 96
Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 10,370 10,462
90+ days past due 0 0
Nonaccrual loans that are current 58 65
Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 4,134 3,950
90+ days past due 0 0
Nonaccrual loans that are current 35 30
Consumer: | Construction and other consumer real estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 751 782
90+ days past due 0 0
Consumer: | Bankcard and other revolving plans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 539 515
90+ days past due 1 1
Nonaccrual loans that are current 1 1
Consumer: | Other    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 113 116
90+ days past due 0 0
Nonaccrual loans that are current 1  
Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 62,246 60,663
Current | Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 32,287 31,553
Current | Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 18,678 18,025
Current | Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 9,314 9,235
Current | Commercial: | Municipal    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 4,295 4,293
Current | Commercial real estate:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 14,131 13,372
Current | Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 11,723 11,211
Current | Commercial real estate: | Construction and land development    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 2,408 2,161
Current | Consumer:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 15,828 15,738
Current | Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 10,323 10,411
Current | Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 4,108 3,920
Current | Consumer: | Construction and other consumer real estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 751 782
Current | Consumer: | Bankcard and other revolving plans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 534 510
Current | Consumer: | Other    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 112 115
Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 226 237
Total past due | Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 123 126
Total past due | Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 80 86
Total past due | Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 43 39
Total past due | Commercial: | Municipal    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 1
Total past due | Commercial real estate:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 24 24
Total past due | Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 24 23
Total past due | Commercial real estate: | Construction and land development    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 1
Total past due | Consumer:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 79 87
Total past due | Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 47 51
Total past due | Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 26 30
Total past due | Consumer: | Construction and other consumer real estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 0
Total past due | Consumer: | Bankcard and other revolving plans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 5 5
Total past due | Consumer: | Other    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 1 1
30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 126 121
30-89 days past due | Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 72 87
30-89 days past due | Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 53 75
30-89 days past due | Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 19 11
30-89 days past due | Commercial: | Municipal    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 1
30-89 days past due | Commercial real estate:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 20 1
30-89 days past due | Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 20 1
30-89 days past due | Commercial real estate: | Construction and land development    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 0
30-89 days past due | Consumer:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 34 33
30-89 days past due | Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 13 10
30-89 days past due | Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 16 19
30-89 days past due | Consumer: | Construction and other consumer real estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 0
30-89 days past due | Consumer: | Bankcard and other revolving plans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 4 3
30-89 days past due | Consumer: | Other    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 1 1
90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 100 116
90+ days past due | Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 51 39
90+ days past due | Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 27 11
90+ days past due | Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 24 28
90+ days past due | Commercial: | Municipal    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 0
90+ days past due | Commercial real estate:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 4 23
90+ days past due | Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 4 22
90+ days past due | Commercial real estate: | Construction and land development    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 1
90+ days past due | Consumer:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 45 54
90+ days past due | Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 34 41
90+ days past due | Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 10 11
90+ days past due | Consumer: | Construction and other consumer real estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 0
90+ days past due | Consumer: | Bankcard and other revolving plans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 1 2
90+ days past due | Consumer: | Other    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 0
Nonaccrual loans that are current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 181 179
Nonaccrual loans that are current | Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 110 92
Nonaccrual loans that are current | Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 88 73
Nonaccrual loans that are current | Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 22 17
Nonaccrual loans that are current | Commercial: | Municipal    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 0 2
Nonaccrual loans that are current | Commercial real estate:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 30 50
Nonaccrual loans that are current | Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 30 50
Nonaccrual loans that are current | Commercial real estate: | Construction and land development    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 0 0
Nonaccrual loans that are current | Consumer:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 41 37
Nonaccrual loans that are current | Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 22 21
Nonaccrual loans that are current | Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 18 15
Nonaccrual loans that are current | Consumer: | Construction and other consumer real estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 0 0
Nonaccrual loans that are current | Consumer: | Bankcard and other revolving plans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 1 1
Nonaccrual loans that are current | Consumer: | Other    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current $ 0 $ 0