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Cover - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 14, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 001-38419    
Entity Registrant Name Arcus Biosciences, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 47-3898435    
Entity Address, Address Line One 3928 Point Eden Way    
Entity Address, City or Town Hayward    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94545    
City Area Code 510    
Local Phone Number 694-6200    
Title of 12(b) Security Common Stock, Par Value $0.0001 Per Share    
Trading Symbol RCUS    
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    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 1,067,561,171
Entity Common Stock, Shares Outstanding   90,864,829  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the Registrant’s Definitive Proxy Statement relating to the 2023 Annual Meeting of Shareholders are incorporated by reference into Part III of this Report. The Definitive Proxy Statement will be filed within 120 days of the Registrant’s fiscal year ended December 31, 2023.
    
Auditor Firm ID 42    
Auditor Name Ernst & Young, LLP    
Auditor Location San Mateo, California    
Entity Central Index Key 0001724521    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false