DISCONTINUED OPERATIONS, SIGNIFICANT DISPOSALS AND OTHER BUSINESS EXITS - Wind Down Charges (Details) - Russian Operations - USD ($) $ in Millions	3 Months Ended	9 Months Ended	13 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax release (charges)	$ (3)	$ 85	$ 55
Institutional Clients Group
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax release (charges)	(2)	10	8
Legacy Franchises
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax release (charges)	(2)	65	44
Corporate/Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax release (charges)	1	10	3
Severance costs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax release (charges)	(4)	37	37
Severance costs | Institutional Clients Group
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax release (charges)	(2)	10	8
Severance costs | Legacy Franchises
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax release (charges)	(3)	17	26
Severance costs | Corporate/Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax release (charges)	1	10	3
Vendor termination and other costs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax release (charges)	1	48	18
Vendor termination and other costs | Institutional Clients Group
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax release (charges)	0	0	0
Vendor termination and other costs | Legacy Franchises
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax release (charges)	1	48	18
Vendor termination and other costs | Corporate/Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pretax release (charges)	$ 0	$ 0	$ 0