ACQUISITIONS, All Other Acquisitions Narrative (Details) - USD ($) $ in Millions		12 Months Ended
	Jun. 01, 2022	Sep. 30, 2022
Charles Stanley and SumRidge Partners
Business Acquisition [Line Items]
Net revenues since acquisition date		$ 187
Net income (loss) since acquisition date		0
TriState Capital
Business Acquisition [Line Items]
Net revenues since acquisition date		141
Net income (loss) since acquisition date		$ 38
Long-term debt assumed	$ 11,700
Unpaid principal balance of PCD loans	337
TriState Capital | Financial Asset Acquired and No Credit Deterioration
Business Acquisition [Line Items]
Long-term debt assumed	$ 11,360