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Holly-Frontier Merger (Narrative) (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Boe
years
Sep. 30, 2010
Business Acquisition [Line Items]    
Annual average crude oil capacity  187,000 
Shares converted at acquisition102.8 102.8 
Common stock to be issued per share of Frontier stock  0.4811 
Market closing price, per share$ 35.93 $ 35.93 
Aggregate consideration paid in connection with merger$ 3,700,000,000 $ 3,700,000,000 
Merger transaction costs recognized15,100,000 15,100,000 
General and administrative expenses43,141,00016,925,00078,641,00050,623,000
Merger Related Integration And Severance Costs [Member]
    
Business Acquisition [Line Items]    
General and administrative expenses154,000,000 13,700,000 
Frontier Refineries [Member]
    
Business Acquisition [Line Items]    
Revenue2,200,000,000   
Income before income taxes$ 397,600,000