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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 21, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-38142    
Entity Registrant Name DELEK US HOLDINGS, INC.    
Entity Incorporation, State or Country Code DE    
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    
City Area Code 615    
Title of 12(b) Security Common Stock, par value $0.01    
Local Phone Number 771-6701    
Trading Symbol DK    
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    
Entity Shell Company false    
Entity Public Float     $ 3,646,155,246
Common Stock, Shares, Outstanding   73,414,200  
Documents Incorporated by Reference
Documents incorporated by reference
Portions of the registrant's definitive Proxy Statement to be delivered to stockholders in connection with the 2020 Annual Meeting of Stockholders, which will be filed with the Securities and Exchange Commission within 120 days after December 31, 2019, are incorporated by reference into Part III of this Annual Report on Form 10-K.
    
Entity Central Index Key 0001694426    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Amendment Flag false