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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details)
$ in Millions
 3 Months Ended 6 Months Ended 27 Months Ended
Oct. 02, 2023
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
May 06, 2025
USD ($)
Dec. 31, 2024
USD ($)
Aug. 06, 2024
USD ($)
Feb. 29, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jul. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]                            
Revenue by segment   $ (666)   $ (722) $ (1,283) $ (1,432)                
Decrease in accounts receivable   (507)     (507)   $ (507)   $ (532)          
Contract liabilities   205     205   205   209          
Increase in assets   3,984     3,984   3,984   4,452          
Decrease in liabilities   (2,841)     (2,841)   (2,841)   (3,245)          
Accumulated other comprehensive income (loss)   (439)     (439)   (439)   (469)          
Cyber ransomware incident recovery costs             47              
Proceeds from insurance settlement, investing activities             36              
Cumulative fraudulent ACH disbursements                     $ 34      
Recovered fraudulent ACH disbursements   16     16   16              
Stock repurchased during period, value   7 $ 62                      
Revenue recognized that was included in contract liabilities         140                  
Remaining performance obligations   1,100     1,100   1,100              
Capitalized software development costs for software sold to customers   295     295   $ 295   $ 302          
Repurchase Program                            
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]                            
Share repurchase program, authorized, amount               $ 200         $ 200 $ 300
Stock repurchased during period, value   $ 7     $ 69                  
Amended and Restated Repurchase Program                            
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]                            
Share repurchase program, authorized, amount               $ 172            
Adjustment                            
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]                            
Revenue by segment       10                    
Decrease in accounts receivable       5   5                
Contract liabilities       $ 5   $ 5                
Increase in assets                       $ 12    
Decrease in liabilities                       7    
Accumulated other comprehensive income (loss)                       $ 19    
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]: 2025-07-01                            
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]                            
Remaining performance obligation, percentage   0.75%     0.75%   0.75%              
Remaining performance obligation, expected timing of satisfaction   12 months     12 months   12 months