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Acquisitions and Dispositions - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 20, 2022
Oct. 17, 2022
Sep. 30, 2022
Apr. 01, 2022
Mar. 31, 2023
Sep. 01, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2022
Business Acquisition [Line Items]                  
Goodwill         $ 37,017       $ 36,811
Tax expense         124     $ 98  
Part noncash divestiture, amount of consideration received         0     $ 111  
Disposal Group, Disposed of by Sale | Fiserv Costa Rica, S.A.                  
Business Acquisition [Line Items]                  
Consideration from sale of business   $ 49              
Gain (loss) on disposition of business   44     (3)        
Tax expense   $ 8              
Disposal Group, Disposed of by Sale | Korea Operations                  
Business Acquisition [Line Items]                  
Consideration from sale of business     $ 50            
Gain (loss) on disposition of business     (127)            
Net proceeds from sale of businesses and other assets     43            
Part noncash divestiture, amount of consideration received     7            
Disposal group, including discontinued operation, goodwill     40            
Disposal group, including discontinued operation, intangible assets     48            
Disposal group, including discontinued operation, accumulated foreign currency translation loss     $ 56            
Merchant One, Inc.                  
Business Acquisition [Line Items]                  
Initial cash payment, net of acquired cash $ 302                
Acquired cash 1                
Increase (decrease) in goodwill         $ 61        
Intangible assets 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          
Pre-tax gain from remeasurement             $ 110    
Other Acquisitions                  
Business Acquisition [Line Items]                  
Intangible assets           $ 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