DISCONTINUED OPERATIONS - Narrative (Details) $ / shares in Units, shares in Thousands, $ in Millions				12 Months Ended			18 Months Ended
	Jul. 01, 2022 USD ($)	Jan. 05, 2022 USD ($) $ / shares shares	Jun. 21, 2021 USD ($) $ / shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 USD ($)	Mar. 07, 2024 country
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity impact as a result of separation				$ (1,237)
Expected tax deductible amount of goodwill						$ 9
Loss - conflict in Eastern Europe					$ 22
Loss from discontinued operations, net of tax, environmental matters				50	$ 4	0
Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of countries transferred to discontinued operation | country								3
Cardtronics
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Transaction costs						$ 46
LibertyX
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Share consideration value		$ 1
New issues (in shares) | shares		1,400
Acquired share price (in dollars per share) | $ / shares		$ 42.13
Number of shares converted (in shares) | shares		200
Total purchase consideration		$ 69
FIS Payment Solutions & Services Private Limited
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total purchase consideration	$ 19
Payments to acquire businesses, gross							$ 12
Cardtronics
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acquired share price (in dollars per share) | $ / shares			$ 39.00
Total purchase consideration			$ 2,674
Expected tax deductible amount of goodwill			$ 139
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				(1,056)
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)
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
Spin-Off of Atleos | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity impact as a result of separation				(1,237)
Spin-Off of Atleos | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | 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				(1,056)
Spin-Off of Atleos | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | 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)
Spin-Off of Atleos | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | 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