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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2022
Feb. 06, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2022    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Entity Registrant Name PARSONS CORPORATION    
Entity Central Index Key 0000275880    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   104,709,490  
Entity Public Float     $ 4.2
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity File Number 001-07782    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 95-3232481    
Entity Address, Address Line One 5875 Trinity Parkway, #300    
Entity Address, City or Town Centreville    
Entity Address, State or Province VA    
Entity Address, Postal Zip Code 21120    
City Area Code 703    
Local Phone Number 988-8500    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag true    
Title of each class Common Stock, $1 par value    
Trading Symbol(s) PSN    
Name of each exchange on which registered NYSE    
Auditor Name PricewaterhouseCoopers LLP    
Auditor Location Los Angeles, California    
Auditor Firm ID 238    
Documents Incorporated by Reference

Portions of Parsons’ 2023 Proxy Statement are incorporated by reference into Part III of this Annual Report on Form 10-K.