Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions		1 Months Ended	3 Months Ended		24 Months Ended
	Oct. 02, 2023	Apr. 30, 2025 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2025 USD ($)	May 06, 2025 USD ($)	Dec. 31, 2024 USD ($)	Aug. 06, 2024 USD ($)	Feb. 29, 2024 USD ($)	Jul. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Cyber ransomware incident recovery costs					$ 47
Proceeds from insurance settlement, investing activities					36
Cumulative fraudulent ACH disbursements									$ 34
Recovered fraudulent ACH disbursements			$ 16		16
Stock repurchased during period, value			62
Revenue recognized that was included in contract liabilities			108	$ 91
Remaining performance obligations			1,100		1,100
Capitalized software development costs for software sold to customers			292		$ 292		$ 302
Repurchase Program
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Share repurchase program, authorized, amount										$ 200	$ 300
Stock repurchased during period, value			$ 62
Repurchase Program | Subsequent Event
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Share repurchase program, authorized, amount						$ 200
Stock repurchased during period, value		$ 7
Amended and Restated Repurchase Program | Subsequent Event
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Share repurchase program, authorized, amount						$ 172
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]: 2025-04-01
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