| Document and Entity Information | May 04, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Document Period End Date | May 4, 2021 |
| Entity Registrant Name | HollyFrontier Corp |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-03876 |
| Entity Tax Identification Number | 75-1056913 |
| Entity Address, Address Line One | 2828 N. Harwood |
| Entity Address, Address Line Two | Suite 1300 |
| Entity Address, City or Town | Dallas |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 75201 |
| City Area Code | 214 |
| Local Phone Number | 871-3555 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, $0.01 par value |
| Trading Symbol | HFC |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Amendment Description | HollyFrontier Corporation (the “Company”) is filing this Amendment No. 1 on Form 8-K/A (this “Amendment No. 1”) to its Current Report on Form 8-K originally filed with the Securities and Exchange Commission on May 4, 2021 (the “Original Form 8-K”), solely to re-furnish Exhibit 99.2, “HollyFrontier Presentation to Investors regarding Puget Sound Refinery Acquisition,” to correct the ninth bullet on slide 5. Except as described above, this Amendment No. 1 does not amend, modify or update the information in the Original Form 8-K. The information provided in Exhibit 99.2 shall not deemed to be “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor shall it be incorporated by reference in any filing made by HollyFrontier pursuant to the Securities Act of 1933, as amended, other than to the extent that such filing incorporates by reference any or all of such information by express reference thereto. |
| Amendment Flag | true |
| Entity Central Index Key | 0000048039 |
