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Acquisitions and Dispositions - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 25, 2023
Dec. 20, 2022
Oct. 17, 2022
Sep. 30, 2022
Apr. 01, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 01, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Business Acquisition [Line Items]                        
Payments for acquisition of businesses, net of cash acquired                 $ 0 $ 682    
Goodwill           $ 36,836     36,836     $ 36,811
Tax expense           239 $ 147   544 382    
Part noncash divestiture, amount of consideration received                 0 111    
Disposal Group, Disposed of by Sale | Financial Reconciliation Business                        
Business Acquisition [Line Items]                        
Net proceeds from sale of businesses and other assets $ 232                      
Gain (loss) on disposition of business           177            
Tax expense           49            
Disposal group, including discontinued operation, goodwill           38     38      
Disposal group, including discontinued operation, trade receivable and capitalized software           $ 13     13      
Disposal Group, Disposed of by Sale | Fiserv Costa Rica, S.A.                        
Business Acquisition [Line Items]                        
Gain (loss) on disposition of business     $ 44           (3)      
Tax expense     8                  
Consideration from sale of business     $ 49                  
Disposal Group, Disposed of by Sale | Korea Operations                        
Business Acquisition [Line Items]                        
Net proceeds from sale of businesses and other assets       $ 43                
Gain (loss) on disposition of business             (120)     (120)    
Disposal group, including discontinued operation, goodwill       40     40     40    
Disposal group, including discontinued operation, accumulated foreign currency translation loss       56     56     56    
Consideration from sale of business       50     50     50    
Part noncash divestiture, amount of consideration received       7                
Disposal group, including discontinued operation, intangible assets       $ 48     $ 48     48    
Merchant One, Inc.                        
Business Acquisition [Line Items]                        
Payments for acquisition of businesses, net of cash acquired   $ 302                    
Acquired cash   1                    
Increase (decrease) in goodwill                 $ 61      
Intangible assets   $ 118                 $ 118  
Goodwill                     179  
Other net assets                     $ 6  
Finxact, Inc.                        
Business Acquisition [Line Items]                        
Intangible assets         $ 105              
Goodwill         670              
Other net assets         1              
Payments for acquisitions of businesses         645              
Cash         $ 27              
Pre-tax gain from remeasurement                   $ 110    
Other Acquisitions                        
Business Acquisition [Line Items]                        
Intangible assets               $ 23       $ 23
Goodwill               22        
Payments for acquisitions of businesses               44        
Earn-out provisions estimated fair value               6        
Other net assumed liabilities               (1)        
Goodwill, expected tax deductible amount               $ 17