DISCONTINUED OPERATIONS, SIGNIFICANT DISPOSALS AND OTHER BUSINESS EXITS - Wind Down Charges (Details) - USD ($) $ in Millions	12 Months Ended			15 Months Ended	28 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2024	Dec. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Additional charges (releases)	$ 259	$ 781	$ 0	$ 1,040
Russian Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Additional charges (releases)	10				$ 73
Estimated additional charges	30			30	30
Russian Operations | All Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Additional charges (releases)	9				64
Estimated additional charges	30			30	30
Russian Operations | Services, Markets and Banking
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Additional charges (releases)	1				9
Estimated additional charges	0			0	0
Employee Severance Costs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Additional charges (releases)	208	$ 687
Employee Severance Costs | Russian Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Additional charges (releases)	9				52
Estimated additional charges	15			15	15
Employee Severance Costs | Russian Operations | All Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Additional charges (releases)	8				43
Estimated additional charges	15			15	15
Employee Severance Costs | Russian Operations | Services, Markets and Banking
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Additional charges (releases)	1				9
Estimated additional charges	0			0	0
Vendor termination and other costs | Russian Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Additional charges (releases)	1				21
Estimated additional charges	15			15	15
Vendor termination and other costs | Russian Operations | All Other
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Additional charges (releases)	1				21
Estimated additional charges	15			15	15
Vendor termination and other costs | Russian Operations | Services, Markets and Banking
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Additional charges (releases)	0				0
Estimated additional charges	$ 0			$ 0	$ 0