Holly-Frontier Merger (Schedule Of Pro Forma Revenues And Net Income) (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Holly-Frontier Merger [Abstract]
Sales and other revenues	$ 5,173,398	$ 3,507,460	$ 14,446,297	$ 10,348,634
Net income attributable to HollyFrontier stockholders	$ 523,088	$ 66,792	$ 1,129,775	$ 142,499
Basic earnings per share	$ 2.50	$ 0.32	$ 5.39	$ 0.68
Diluted earnings per share	$ 2.48	$ 0.32	$ 5.37	$ 0.68

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph r(2, 3)

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 54

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 55

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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period

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