2.625% Senior Notes due October 2023

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4.5% Senior Notes due October 2030

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5.875% Senior Notes due April 2026

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Debt (Carrying Amounts Of Long-Term Debt) (Details) - USD ($)	Sep. 30, 2020	Sep. 28, 2020	Feb. 04, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
2.625% Senior Notes due October 2023	$ 350,000,000	$ 350,000,000.0		$ 0
5.875% Senior Notes due April 2026	1,000,000,000.0
4.5% Senior Notes due October 2030	400,000,000	$ 400,000,000.0		0
Senior notes	1,750,000,000			1,000,000,000
Unamortized discount and debt issuance costs	(13,525,000)			(6,391,000)
Total HollyFrontier long-term debt	1,736,475,000			993,609,000
HEP Credit Agreement	0
Senior notes	500,000,000			500,000,000
Long-term debt (HEP: $1,439,874 and $1,462,031, respectively)	3,176,349,000			2,455,640,000
Total long-term debt	3,176,349,000			2,455,640,000
Five Point Eight Seven Five Percentage Senior Notes Due Two Thousand Twenty-Six [Member] [Member]
Debt Instrument [Line Items]
5.875% Senior Notes due April 2026	1,000,000,000			1,000,000,000
Five Percent Senior Notes Due Two Thousand Twenty Eight [Member]
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs	(8,126,000)			(3,469,000)
Senior notes	500,000,000		$ 500,000,000.0	0
Six Percent Senior Notes Due Two Thousand Twenty Four [Member]
Debt Instrument [Line Items]
Senior notes	0			500,000,000
HEP
Debt Instrument [Line Items]
HEP Credit Agreement	948,000,000.0			965,500,000
HEP long-term debt	1,439,874,000			1,462,031,000
Level 2 [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	10,491,000			11,637,000
Level 2 [Member] \| Senior Notes [Member]
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	1,835,996,000			1,127,610,000
Level 2 [Member] \| Senior Notes [Member] \| HEP
Debt Instrument [Line Items]
Financial Liabilities Fair Value Disclosure	$ 490,155,000			$ 522,045,000