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Document and Entity Information Document - shares
6 Months Ended
Jun. 30, 2018
Aug. 03, 2018
DOCUMENT AND ENTITY INFORMATION [Abstract]    
Entity Registrant Name Delek US Holdings, Inc.  
Entity Central Index Key 0001694426  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Document Type 10-Q  
Document Period End Date Jun. 30, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   83,946,302
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes