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Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2021
Jan. 31, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 1-8729    
Entity Registrant Name UNISYS CORP    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 38-0387840    
Entity Address, Address Line One 801 Lakeview Drive    
Entity Address, Address Line Two Suite 100    
Entity Address, City or Town Blue Bell    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 19422    
City Area Code 215    
Local Phone Number 986-4011    
Title of 12(b) Security Common Stock, par value $.01    
Trading Symbol UIS    
Security Exchange Name NYSE    
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    
Entity Shell Company false    
Entity Public Float     $ 1.7
Entity Common Stock, Shares Outstanding   67,232,146  
Documents Incorporated by Reference Portions of Unisys Corporation’s Definitive Proxy Statement for the 2022 Annual Meeting of Stockholders are incorporated by reference into Part III hereof.    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000746838