v3.8.0.1
Document And Entity Information - USD ($)
$ in Billions
3 Months Ended
Mar. 31, 2018
Apr. 27, 2018
Jun. 30, 2017
Document And Entity Information [Abstract]      
Entity Registrant Name HollyFrontier Corp    
Entity Central Index Key 0000048039    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Document Type 10-Q    
Document Period End Date Mar. 31, 2018    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus Q1    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   176,542,274  
Entity Public Float     $ 4.5