Document and Entity Information
| Document and Entity Information | Jan. 27, 2022 |
| Cover [Abstract] | |
| Document type | 8-K |
| Document period end date | Jan. 27, 2022 |
| Entity registrant name | VALERO ENERGY CORP/TX |
| Entity incorporation, state or country code | DE |
| Entity file number | 001-13175 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) security | Common stock |
| Trading symbol | VLO |
| Security exchange name | NYSE |
| Entity emerging growth company | false |
| Entity central index key | 0001035002 |
| Amendment flag | false |