Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions		3 Months Ended				9 Months Ended
	Oct. 02, 2023	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Aug. 06, 2024 USD ($)	Dec. 31, 2023 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Cyber ransomware incident recovery costs						$ 46
Proceeds from insurance settlement, investing activities						21
Insurance settlements receivable		$ 6				6
Compensation expense					$ 10
Revenue		711		$ 809		2,144	$ 2,382
Accounts receivable		623				623			$ 414
Contract liabilities		186				186			157
Total assets		4,674				4,674			4,990
Total liabilities		(3,387)				(3,387)			(4,689)
Total equity		1,011				1,011			25
Other income (expense), net		(15)		(20)		(40)	(33)
Other current liabilities		782				782			421
Accumulated other comprehensive loss		(460)				(460)			(429)
Cumulative fraudulent ACH disbursements		34				34
Recovered fraudulent ACH disbursements		15				15
Revenue recognized that was included in contract liabilities						131	159
Remaining performance obligations		946				946
Capitalized software development costs for software sold to customers		311				311			317
Adjustment
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue			$ (10)	0			0
Accounts receivable			(5)
Contract liabilities			$ 5
Total assets									12
Total liabilities									7
Total equity									$ 19
Other income (expense), net		8		$ 0			$ 0
Other current liabilities		4				4
Accumulated other comprehensive loss		$ 4				$ 4
Digital Banking Segment | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [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
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Conversion ratio	0.50
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percentage		0.75%				0.75%
Remaining performance obligation, expected timing of satisfaction		12 months				12 months