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Cover - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 11, 2025
Jun. 30, 2024
Cover      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-16427    
Entity Registrant Name Fidelity National Information Services, Inc.    
Entity Incorporation, State or Country Code GA    
Entity Tax Identification Number 37-1490331    
Entity Address, Street Address 347 Riverside Avenue    
Entity Address, City Jacksonville    
Entity Address, State FL    
Entity Address, Zip Code 32202    
City Area Code 904    
Local Phone Number 438-6000    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction true    
Document Financial Statement Restatement Recovery Analysis [Flag] true    
Entity Shell Company false    
Entity Public Float     $ 41,321,625,726
Entity Common Stock, Shares Outstanding (in shares)   529,691,586  
Documents Incorporated by Reference
The information in Part III hereof is incorporated herein by reference to the registrant’s Proxy Statement on Schedule 14A for the fiscal year ended December 31, 2024, to be filed within 120 days after the close of the fiscal year that is the subject of this Report.
    
Entity Central Index Key 0001136893    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Common Stock, par value $0.01 per share      
Cover      
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol FIS    
Security Exchange Name NYSE    
0.625% Senior Notes due 2025      
Cover      
Title of 12(b) Security 0.625% Senior Notes due 2025    
Trading Symbol FIS25B    
Security Exchange Name NYSE    
1.500% Senior Notes due 2027      
Cover      
Title of 12(b) Security 1.500% Senior Notes due 2027    
Trading Symbol FIS27    
Security Exchange Name NYSE    
1.000% Senior Notes due 2028      
Cover      
Title of 12(b) Security 1.000% Senior Notes due 2028    
Trading Symbol FIS28    
Security Exchange Name NYSE    
2.250% Senior Notes due 2029      
Cover      
Title of 12(b) Security 2.250% Senior Notes due 2029    
Trading Symbol FIS29    
Security Exchange Name NYSE    
2.000% Senior Notes due 2030      
Cover      
Title of 12(b) Security 2.000% Senior Notes due 2030    
Trading Symbol FIS30    
Security Exchange Name NYSE    
3.360% Senior Notes due 2031      
Cover      
Title of 12(b) Security 3.360% Senior Notes due 2031    
Trading Symbol FIS31    
Security Exchange Name NYSE    
2.950% Senior Notes due 2039      
Cover      
Title of 12(b) Security 2.950% Senior Notes due 2039    
Trading Symbol FIS39    
Security Exchange Name NYSE