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LOANS, LEASES, AND ALLOWANCE FOR CREDIT LOSSES (Summary of Past Due Loans (Accruing and Nonaccruing)) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans $ 60,302 $ 59,410
90+ days past due 5 18
Nonaccrual loans that are current 319 297
Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 31,179 30,965
90+ days past due 3 14
Nonaccrual loans that are current 153 158
Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 17,222 16,891
90+ days past due 3 1
Nonaccrual loans that are current 107 114
Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 9,267 9,333
90+ days past due 0 3
Nonaccrual loans that are current 40 31
Commercial: | Municipal    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 4,341 4,364
90+ days past due 0 10
Nonaccrual loans that are current 2 11
Commercial: | Leasing    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 349 377
90+ days past due 0 0
Nonaccrual loans that are current 4 2
Commercial real estate:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 13,477 13,477
90+ days past due 1 3
Nonaccrual loans that are current 70 59
Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 11,008 10,703
90+ days past due 1 3
Nonaccrual loans that are current 70 59
Commercial real estate: | Construction and land development    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 2,469 2,774
90+ days past due 0 0
Consumer:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 15,646 14,968
90+ days past due 1 1
Nonaccrual loans that are current 96 80
Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 10,423 9,939
90+ days past due 0 0
Nonaccrual loans that are current 63 49
Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 3,848 3,641
90+ days past due 0 0
Nonaccrual loans that are current 32 30
Consumer: | Construction and other consumer real estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 769 810
90+ days past due 0 0
Consumer: | Bankcard and other revolving plans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 477 457
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 129 121
90+ days past due 0 0
Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 60,081 59,221
Current | Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 31,107 30,891
Current | Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 17,188 16,857
Current | Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 9,231 9,309
Current | Commercial: | Municipal    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 4,341 4,348
Current | Commercial: | Leasing    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 347 377
Current | Commercial real estate:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 13,410 13,441
Current | Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 10,941 10,667
Current | Commercial real estate: | Construction and land development    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 2,469 2,774
Current | Consumer:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 15,564 14,889
Current | Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 10,374 9,896
Current | Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 3,820 3,609
Current | Consumer: | Construction and other consumer real estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 768 810
Current | Consumer: | Bankcard and other revolving plans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 473 453
Current | Consumer: | Other    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 129 121
Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 221 189
Total past due | Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 72 74
Total past due | Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 34 34
Total past due | Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 36 24
Total past due | Commercial: | Municipal    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 16
Total past due | Commercial: | Leasing    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 2 0
Total past due | Commercial real estate:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 67 36
Total past due | Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 67 36
Total past due | Commercial real estate: | Construction and land development    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 0
Total past due | Consumer:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 82 79
Total past due | Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 49 43
Total past due | Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 28 32
Total past due | Consumer: | Construction and other consumer real estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 1 0
Total past due | Consumer: | Bankcard and other revolving plans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 4 4
Total past due | Consumer: | Other    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 0
30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 103 76
30-89 days past due | Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 36 36
30-89 days past due | Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 18 20
30-89 days past due | Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 17 10
30-89 days past due | Commercial: | Municipal    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 6
30-89 days past due | Commercial: | Leasing    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 1 0
30-89 days past due | Commercial real estate:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 35 2
30-89 days past due | Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 35 2
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 32 38
30-89 days past due | Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 12 16
30-89 days past due | Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 16 20
30-89 days past due | Consumer: | Construction and other consumer real estate    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 1 0
30-89 days past due | Consumer: | Bankcard and other revolving plans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 3 2
30-89 days past due | Consumer: | Other    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 0
90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 118 113
90+ days past due | Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 36 38
90+ days past due | Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 16 14
90+ days past due | Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 19 14
90+ days past due | Commercial: | Municipal    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 10
90+ days past due | Commercial: | Leasing    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 1 0
90+ days past due | Commercial real estate:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 32 34
90+ days past due | Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 32 34
90+ days past due | Commercial real estate: | Construction and land development    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 0
90+ days past due | Consumer:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 50 41
90+ days past due | Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 37 27
90+ days past due | Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 12 12
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 173 183
Nonaccrual loans that are current | Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 111 127
Nonaccrual loans that are current | Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 92 98
Nonaccrual loans that are current | Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 15 16
Nonaccrual loans that are current | Commercial: | Municipal    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 2 11
Nonaccrual loans that are current | Commercial: | Leasing    
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 23 28
Nonaccrual loans that are current | Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 23 28
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 39 28
Nonaccrual loans that are current | Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 23 15
Nonaccrual loans that are current | Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current 15 13
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 0 0
Nonaccrual loans that are current | Consumer: | Other    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Nonaccrual loans that are current $ 1 $ 0