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LOANS, LEASES, AND ALLOWANCE FOR CREDIT LOSSES (Summary Aging Analysis, Modified) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Sep. 30, 2024
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total $ 559 $ 307
Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 525 285
Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 34 22
30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 22 12
90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 12 10
Commercial:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 139 100
Commercial: | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 136 85
Commercial: | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 3 15
Commercial: | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 2 12
Commercial: | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 1 3
Commercial: | Commercial and industrial    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 106 83
Commercial: | Commercial and industrial | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 104 76
Commercial: | Commercial and industrial | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 2 7
Commercial: | Commercial and industrial | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 2 4
Commercial: | Commercial and industrial | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0 3
Commercial: | Owner-occupied    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 33 6
Commercial: | Owner-occupied | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 32 6
Commercial: | Owner-occupied | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 1 0
Commercial: | Owner-occupied | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0 0
Commercial: | Owner-occupied | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 1 0
Commercial: | Municipal    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total   11
Commercial: | Municipal | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total   3
Commercial: | Municipal | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total   8
Commercial: | Municipal | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total   8
Commercial: | Municipal | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total   0
Commercial real estate:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 406 201
Commercial real estate: | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 378 194
Commercial real estate: | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 28 7
Commercial real estate: | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 18 0
Commercial real estate: | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 10 7
Commercial real estate: | Term    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 380 175
Commercial real estate: | Term | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 352 170
Commercial real estate: | Term | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 28 5
Commercial real estate: | Term | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 18 0
Commercial real estate: | Term | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 10 5
Commercial real estate: | Construction and land development    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 26 26
Commercial real estate: | Construction and land development | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 26 24
Commercial real estate: | Construction and land development | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 0 2
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 2
Consumer:    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 14 6
Consumer: | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 11 6
Consumer: | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 3 0
Consumer: | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 2 0
Consumer: | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 1 0
Consumer: | 1-4 family residential    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 12 4
Consumer: | 1-4 family residential | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 10 4
Consumer: | 1-4 family residential | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 2 0
Consumer: | 1-4 family residential | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 1 0
Consumer: | 1-4 family residential | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 1 0
Consumer: | Home equity credit line    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 2 1
Consumer: | Home equity credit line | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 1 1
Consumer: | Home equity credit line | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 1 0
Consumer: | Home equity credit line | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total 1 0
Consumer: | Home equity credit line | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total $ 0 0
Consumer: | Other    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total   1
Consumer: | Other | Current    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total   1
Consumer: | Other | Total past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total   0
Consumer: | Other | 30-89 days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total   0
Consumer: | Other | 90+ days past due    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total   $ 0