v3.26.1
LOANS, LEASES, AND ALLOWANCE FOR CREDIT LOSSES (Summary Aging Analysis, Modified) (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Jun. 30, 2025
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total $ 657 $ 420
Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 645 404
Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 12 16
30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 5 2
90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 7 14
Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 165 72
Commercial: | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 153 67
Commercial: | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 12 5
Commercial: | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 5 2
Commercial: | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 7 3
Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 125 67
Commercial: | Commercial and industrial | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 118 63
Commercial: | Commercial and industrial | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 7 4
Commercial: | Commercial and industrial | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 5 1
Commercial: | Commercial and industrial | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 2 3
Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 40 5
Commercial: | Owner-occupied | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 35 4
Commercial: | Owner-occupied | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 5 1
Commercial: | Owner-occupied | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0 1
Commercial: | Owner-occupied | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 5 0
Commercial real estate:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 486 341
Commercial real estate: | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 486 331
Commercial real estate: | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0 10
Commercial real estate: | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0 0
Commercial real estate: | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0 10
Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 477 316
Commercial real estate: | Term | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 477 306
Commercial real estate: | Term | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0 10
Commercial real estate: | Term | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0 0
Commercial real estate: | Term | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0 10
Commercial real estate: | Construction and land development    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 9 25
Commercial real estate: | Construction and land development | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 9 25
Commercial real estate: | Construction and land development | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0 0
Commercial real estate: | Construction and land development | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0 0
Commercial real estate: | Construction and land development | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0 0
Consumer:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 6  
Consumer: | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 6  
Consumer: | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0  
Consumer: | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0  
Consumer: | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0  
Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 5 7
Consumer: | 1-4 family residential | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 5 6
Consumer: | 1-4 family residential | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0 1
Consumer: | 1-4 family residential | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0 0
Consumer: | 1-4 family residential | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0 $ 1
Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 1  
Consumer: | Home equity credit line | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 1  
Consumer: | Home equity credit line | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0  
Consumer: | Home equity credit line | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0  
Consumer: | Home equity credit line | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total $ 0