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Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2020
Feb. 19, 2021
Jun. 30, 2020
Cover [Abstract]      
Document type 10-K    
Document annual report true    
Document period end date Dec. 31, 2020    
Current fiscal year end date --12-31    
Document transition report false    
Entity file number 001-13175    
Entity registrant name VALERO ENERGY CORP/TX    
Entity incorporation, state or country code DE    
Entity tax identification number 74-1828067    
Entity address, address line one One Valero Way    
Entity address, city or town San Antonio    
Entity address, state or province TX    
Entity address, postal zip code 78249    
City area code 210    
Local phone number 345-2000    
Title of 12(b) security Common stock    
Trading symbol VLO    
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     $ 24.0
Entity common stock, shares outstanding   408,562,891  
Documents incorporated by reference
DOCUMENTS INCORPORATED BY REFERENCE
We intend to file with the Securities and Exchange Commission a definitive Proxy Statement for our Annual Meeting of Stockholders scheduled for April 29, 2021, at which directors will be elected. Portions of the 2021 Proxy Statement are incorporated by reference in Part III of this Form 10-K and are deemed to be a part of this report.
    
Entity central index key 0001035002    
Amendment flag false    
Document fiscal year focus 2020    
Document fiscal period focus FY