v3.26.1
Acquisitions - Narrative (Details)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 09, 2026
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
business
shares
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
business
Business Combination              
Goodwill   $ 25,026   $ 25,026 $ 25,026   $ 17,762
Issuer Solutions Acquisition              
Business Combination              
Business combination, voting equity interest acquired, percentage 100.00%            
FIS' interest in Worldpay $ 5,762            
Cash consideration 7,695            
Adjustment in deferred taxes and valuation of intangible assets   466          
Gross contractual amount of trade receivables acquired 325            
Goodwill, expected tax deductible 5,500            
Business combination, acquiree's revenue since acquisition date, actual   666     1,258    
Business combination, acquiree's earnings (loss) since acquisition date, actual   37     72    
Net earnings (loss) attributable to FIS   261 $ 65 448   $ 2,250  
Total purchase price 13,473            
Goodwill $ 6,997            
Issuer Solutions Acquisition | Business Combination, Pro Forma Information, Nonrecurring Adjustment, Gain On Remeasurement Of Equity Interest In Worldpay              
Business Combination              
Net earnings (loss) attributable to FIS           2,206  
Issuer Solutions Acquisition | Business Combination, Pro Forma Information, Nonrecurring Adjustment, Selling, General And Administrative Expense              
Business Combination              
Net earnings (loss) attributable to FIS   (8)   $ (12)   $ 49  
Issuer Solutions Acquisition | Customer Relationships              
Business Combination              
Acquired finite-lived intangible assets, weighted average useful life 10 years            
Finite-lived intangible assets acquired $ 3,580            
Issuer Solutions Acquisition | Trademarks              
Business Combination              
Acquired finite-lived intangible assets, weighted average useful life 2 years            
Finite-lived intangible assets acquired $ 35            
Issuer Solutions Acquisition | Software              
Business Combination              
Acquired finite-lived intangible assets, weighted average useful life 7 years            
Finite-lived intangible assets acquired $ 2,020            
Issuer Solutions Acquisition | Unsecured Debt              
Business Combination              
Proceeds from unsecured lines of credit 7,700            
Liabilities incurred $ 7,700            
2026 Business Combinations              
Business Combination              
Number of businesses acquired | business       2      
Total purchase price       $ 505      
Consideration transferred, equity interest, share issued, number of shares (in shares) | shares       1.3      
Liabilities incurred       $ 110      
Business combination, contingent consideration, range of outcomes, minimum, amount   0   0 0    
Business combination, contingent consideration, range of outcomes, maximum, amount   834   834 834    
Goodwill   366   366 366    
Adjustment in goodwill   12          
2026 Business Combinations | Indemnification Agreement              
Business Combination              
Guarantor obligations, maximum exposure   170   170 170    
2026 Business Combinations | Customer Relationships              
Business Combination              
Business combination, recognized identifiable assets acquired and liabilities assumed, goodwill   93   93 93    
2026 Business Combinations | Software              
Business Combination              
Business combination, recognized identifiable assets acquired and liabilities assumed, goodwill   92   92 92    
2025 Business Combinations              
Business Combination              
Cash consideration             $ 571
Number of businesses acquired | business             2
Total purchase price             $ 586
Goodwill   326   326 326    
Estimated fair value of contingent consideration             $ 15
2025 Business Combinations | Customer Relationships              
Business Combination              
Business combination, recognized identifiable assets acquired and liabilities assumed, goodwill   163   163 163    
2025 Business Combinations | Software              
Business Combination              
Business combination, recognized identifiable assets acquired and liabilities assumed, goodwill   $ 85   $ 85 $ 85