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DISCONTINUED OPERATIONS - Narrative (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions			12 Months Ended
	Sep. 30, 2024	Jan. 05, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity impact as a result of separation			$ 23	$ (1,238)
Loss - conflict in Eastern Europe					$ 22
Loss from discontinued operations, net of tax, environmental matters			10	50	4
Net cash provided by (used in) operating activities of discontinued operations			(20)	(19)	(20)
LibertyX
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Share consideration value		$ 1
New issues (in shares)		1,400
Acquired share price (in dollars per share)		$ 42.13
Number of shares converted (in shares)		200
Business combination, consideration transferred		$ 69
Retained Earnings (Deficit)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity impact as a result of separation			13	(1,057)
Accumulated Other Comprehensive (Loss) Income
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity impact as a result of separation			10	(182)
Noncontrolling Interests in Subsidiaries
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity impact as a result of separation				1
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Digital Banking Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of business	$ 1,500		1,530	0	0
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Spin-Off of Atleos
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity impact as a result of separation				(1,238)
Net cash provided by (used in) operating activities of discontinued operations			$ (8)	336	$ 272
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Spin-Off of Atleos | Retained Earnings (Deficit)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity impact as a result of separation				(1,057)
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Spin-Off of Atleos | Accumulated Other Comprehensive (Loss) Income
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity impact as a result of separation				(182)
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Spin-Off of Atleos | Noncontrolling Interests in Subsidiaries
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity impact as a result of separation				$ 1

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