Line of Credit Facility, Accordion Feature

No definition available.

Name:	hfc_LineofCreditFacilityAccordionFeature
Namespace Prefix:	hfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt discount.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Gross amount of debt extinguished.

+ References

No definition available.

+ Details

Name:	us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for financing purchases of goods acquired for inventory or imminent delivery to a customer.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCapacityAvailableForTradePurchases
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The effective interest rate during the reporting period.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share.

+ References

No definition available.

+ Details

Name:	us-gaap_RedemptionPremium
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of cash inflow after closing and debt issuance costs received by a seller-lessee in a sale-leaseback recognized in financing activities.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

+ References

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Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

- Details

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Namespace Prefix:
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- Details

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- Details

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- Details

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Debt - Narrative (Details) - USD ($)		1 Months Ended	3 Months Ended	12 Months Ended
Debt - Narrative (Details) - USD ($)	Feb. 05, 2020	Dec. 31, 2018	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 28, 2020	Feb. 04, 2020
Debt Instrument [Line Items]
Maximum borrowing capacity under revolving credit agreement				$ 1,350,000,000
Letters of credit amount outstanding				$ 5,700,000
Effective interest rate on debt				2.58%	4.24%
Senior notes principal amount				$ 1,750,000,000	$ 1,000,000,000
Financing arrangement sale leaseback proceeds		$ 32,500,000
Fair value of financing arrangements				43,900,000	40,000,000.0
Redemption cost	$ 522,500,000
Loss on early extinguishment of debt			$ 25,900,000	(25,915,000)	0	$ 0
Debt redemption premium			$ 22,500,000
Unamortized discount				12,885,000	6,391,000			$ 3,400,000
HEP
Debt Instrument [Line Items]
Maximum borrowing capacity under revolving credit agreement				1,400,000,000
Proceeds from line of credit				258,500,000
Repayments of lines of credit				(310,500,000)
HEP Credit Agreement				913,500,000	965,500,000
Senior notes principal amount				500,000,000	500,000,000
Unamortized discount				7,897,000	3,469,000
Letter of Credit \| HEP
Debt Instrument [Line Items]
Line of credit accordion feature value				300,000,000
5.875% Senior Notes
Debt Instrument [Line Items]
Senior notes principal amount				$ 1,000,000,000	1,000,000,000
Stated interest rate				5.875%
6.00% Senior Notes
Debt Instrument [Line Items]
Effective interest rate on debt								6.00%
Stated interest rate				6.00%
6.00% Senior Notes \| HEP
Debt Instrument [Line Items]
Senior notes principal amount				$ 0	500,000,000			$ 500,000,000.0
5.00% Senior Notes
Debt Instrument [Line Items]
Effective interest rate on debt								5.00%
Stated interest rate				5.00%
Aggregate principal amount of senior note								$ 500,000,000.0
5.00% Senior Notes \| HEP
Debt Instrument [Line Items]
Senior notes principal amount				$ 500,000,000	0
2.625% Senior Notes
Debt Instrument [Line Items]
Senior notes principal amount				$ 350,000,000	0		$ 350,000,000.0
Stated interest rate				0.02625%			2.625%
4.500% Senior Notes
Debt Instrument [Line Items]
Senior notes principal amount				$ 400,000,000	$ 0		$ 400,000,000.0
Stated interest rate				4.50%			4.50%
Maximum \| Letter of Credit \| HEP
Debt Instrument [Line Items]
Line of credit, maximum capacity available				$ 50,000,000
Alternative A \| Minimum
Debt Instrument [Line Items]
Credit agreement interest rate				0.125%
Alternative A \| Maximum
Debt Instrument [Line Items]
Credit agreement interest rate				1.00%
Alternative B \| Minimum
Debt Instrument [Line Items]
Credit agreement interest rate				1.125%
Alternative B \| Maximum
Debt Instrument [Line Items]
Credit agreement interest rate				2.00%
Alternative C \| Minimum
Debt Instrument [Line Items]
Credit agreement interest rate				1.125%
Alternative C \| Maximum
Debt Instrument [Line Items]
Credit agreement interest rate				2.00%