BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Millions		2 Months Ended	3 Months Ended								9 Months Ended	12 Months Ended
	Oct. 02, 2023	Feb. 27, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 06, 2024 USD ($)	Jul. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Recovery costs, cyber ransomware												$ 47
Insurance settlements receivable			$ 36									36
Out-of-period adjustment to increase operating expenses										$ 10
Revenue by segment			(682)	$ (711)	$ (722)	$ (711)	$ (796)	$ (809)	$ (805)	$ (768)		(2,826)	$ (3,178)	$ (3,174)
Total accounts receivable, net			539				414					539	414
Contract liabilities			211				157					211	157
Other income (expense), net												(36)	(76)	18
Other current liabilities			726				421					726	421
Accumulated other comprehensive loss			(469)				(429)					(469)	(429)
Increase in assets			4,452				4,990					4,452	4,990
Decrease in liabilities			(3,245)				(4,689)					(3,245)	(4,689)
Fraudulent ACH disbursements, cumulative			34									34
Fraudulent ACH disbursements, recovered			16									16
Fraudulent disbursement, amount													23
Fraudulent disbursements, amount recorded on balance sheet											$ 11			2
Remaining performance obligation			1,100									1,100
Interest paid, excluding capitalized interest												145	365	268
Income taxes paid, net												54	92	56
Allowance for credit loss			26				29					26	29
Credit loss charged to expense												15	26
Allowance for credit loss, writeoff													15
Current portion of contract assets			0									0
Contract with customer, liability, revenue recognized												144	118	127
Settlement assets			50				46					50	46
Settlement liabilities			$ 47				39					47	39
Depreciation												55	55	55
Stock repurchased during period, value												56
Repurchase Program
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stock repurchase program, maximum authorized amount																$ 200	$ 300
Stock repurchased during period, value												56
Repurchase Program | Subsequent Event
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stock repurchased during period, value		$ 44
SEC Schedule, 12-09, Allowance, Credit Loss
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deductions												$ 18	$ 15	13
LibertyX
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Business combination, consideration transferred, non-cash														68
Noncash transaction debt assumed														$ 2
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Software product contract term												1 year
Maximum | Machinery and other equipment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, useful life			20 years									20 years
Maximum | Building
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, useful life			45 years									45 years
Maximum | Software Development Costs, Internal Use
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized computer software, useful life												7 years
Maximum | Software and Software Development Costs
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized computer software, useful life												5 years
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Software product contract term												1 month
Minimum | Machinery and other equipment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, useful life			3 years									3 years
Minimum | Building
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, useful life			25 years									25 years
Minimum | Software Development Costs, Internal Use
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized computer software, useful life												4 years
Minimum | Software and Software Development Costs
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Capitalized computer software, useful life												3 years
Bill and Hold Transactions | Maximum | Revenue Benchmark
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk, percentage (as percent)												2.00%	2.00%	2.00%
Revision of Prior Period, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue by segment					10
Total accounts receivable, net					(5)		(2)						$ (2)
Contract liabilities					5
Prior period reclassification adjustment				2	$ 4
Other income (expense), net				8
Other current liabilities				4
Accumulated other comprehensive loss				$ 4			16						16
Increase in assets							9						9
Decrease in liabilities							7						$ 7
Operating expenses							$ 2
Digital Banking Segment | Disposal Group, Disposed of by Sale, Not Discontinued Operations
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Disposal group, consideration															$ 2,450
Disposal group, potential earnout, maximum															$ 100
NCR Atleos Corporation | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations, Spinoff
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Conversion ratio	0.50
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining performance obligation, percentage			0.75%									0.75%
Remaining performance obligation, expected timing of satisfaction, period			12 months									12 months