| Cover Page Document | Jan. 20, 2021 |
| Cover [Abstract] | |
| Entity Central Index Key | 0001694426 |
| Title of 12(b) Security | Common Stock, $0.01 par value |
| Local Phone Number | 771-6701 |
| Entity Incorporation, State or Country Code | DE |
| Document Period End Date | Jan. 20, 2021 |
| Document Type | 8-K |
| Entity Registrant Name | DELEK US HOLDINGS, INC. |
| City Area Code | 615 |
| Entity File Number | 001-38142 |
| Entity Tax Identification Number | 35-2581557 |
| Entity Address, Address Line One | 7102 Commerce Way |
| Entity Address, City or Town | Brentwood |
| Entity Address, State or Province | TN |
| Entity Address, Postal Zip Code | 37027 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Trading Symbol | DK |
| Security Exchange Name | NYSE |
| Amendment Flag | false |
