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LOANS AND LEASES - Nonaccrual Loans by Loan Class (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans and leases with no ACL | $ 81 | $ 146
Total nonaccrual loans and leases | 808 | 783
Commercial | Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans and leases with no ACL | 22 | 71
Total nonaccrual loans and leases | 455 | 457
Commercial | Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans and leases with no ACL | 56 | 75
Total nonaccrual loans and leases | 131 | 118
Commercial | Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans and leases with no ACL | 0 | 0
Total nonaccrual loans and leases | 10 | 10
Consumer | Residential mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans and leases with no ACL | 3 | 0
Total nonaccrual loans and leases | 97 | 83
Consumer | Automobile |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans and leases with no ACL | 0 | 0
Total nonaccrual loans and leases | 6 | 6
Consumer | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans and leases with no ACL | 0 | 0
Total nonaccrual loans and leases | 108 | 107
Consumer | RV and marine |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans and leases with no ACL | 0 | 0
Total nonaccrual loans and leases | $ 1 | $ 2

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