v3.26.1
LOANS, LEASES, AND ALLOWANCE FOR CREDIT LOSSES (Summary of Past Due Loans (Accruing and Nonaccruing)) (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans $ 62,481 $ 60,900
90+ days past due 3 5
Nonaccrual loans that are current 292 315
Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 32,640 31,679
90+ days past due 2 3
Nonaccrual loans that are current 152 146
Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 19,131 18,111
90+ days past due 2 2
Nonaccrual loans that are current 96 93
Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 9,336 9,274
90+ days past due 0 1
Nonaccrual loans that are current 54 51
Commercial: | Municipal    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 4,173 4,294
90+ days past due 0 0
Nonaccrual loans that are current 2 2
Commercial real estate:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 14,063 13,396
90+ days past due 0 1
Nonaccrual loans that are current 34 73
Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 11,850 11,234
90+ days past due 0 1
Nonaccrual loans that are current 34 72
Commercial real estate: | Construction and land development    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 2,213 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 15,778 15,825
90+ days past due 1 1
Nonaccrual loans that are current 106 96
Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 10,293 10,462
90+ days past due 0 0
Nonaccrual loans that are current 69 65
Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 4,077 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 757 782
90+ days past due 0 0
Consumer: | Bankcard and other revolving plans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 537 515
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 114 116
90+ days past due 0 0
Nonaccrual loans that are current 1  
Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 62,263 60,663
Current | Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 32,530 31,553
Current | Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 19,065 18,025
Current | Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 9,292 9,235
Current | Commercial: | Municipal    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 4,173 4,293
Current | Commercial real estate:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 14,033 13,372
Current | Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 11,820 11,211
Current | Commercial real estate: | Construction and land development    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 2,213 2,161
Current | Consumer:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 15,700 15,738
Current | Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 10,242 10,411
Current | Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 4,053 3,920
Current | Consumer: | Construction and other consumer real estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 757 782
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 114 115
Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 218 237
Total past due | Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 110 126
Total past due | Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 66 86
Total past due | Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 44 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 30 24
Total past due | Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 30 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 78 87
Total past due | Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 51 51
Total past due | Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 24 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 3 5
Total past due | Consumer: | Other    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 1
30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 107 121
30-89 days past due | Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 54 87
30-89 days past due | Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 30 75
30-89 days past due | Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 24 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 25 1
30-89 days past due | Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 25 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 28 33
30-89 days past due | Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 11 10
30-89 days past due | Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 15 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 2 3
30-89 days past due | Consumer: | Other    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 1
90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 111 116
90+ days past due | Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 56 39
90+ days past due | Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 36 11
90+ days past due | Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 20 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 5 23
90+ days past due | Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 5 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 50 54
90+ days past due | Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 40 41
90+ days past due | Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 9 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 168 179
Nonaccrual loans that are current | Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 90 92
Nonaccrual loans that are current | Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 62 73
Nonaccrual loans that are current | Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 26 17
Nonaccrual loans that are current | Commercial: | Municipal    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 2 2
Nonaccrual loans that are current | Commercial real estate:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 29 50
Nonaccrual loans that are current | Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 29 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 49 37
Nonaccrual loans that are current | Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 27 21
Nonaccrual loans that are current | Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 21 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