LOANS, LEASES, AND ALLOWANCE FOR CREDIT LOSSES (Summary of Accrued Interest Receivables Reversed) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Financing Receivable, Past Due [Line Items]
Accrued interest receivable written off	$ 5	$ 6
Commercial:
Financing Receivable, Past Due [Line Items]
Accrued interest receivable written off	3	4
Commercial real estate:
Financing Receivable, Past Due [Line Items]
Accrued interest receivable written off	1	1
Consumer:
Financing Receivable, Past Due [Line Items]
Accrued interest receivable written off	$ 1	$ 1

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details