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Related Party Transactions - Commercial Agreements (Details) $ in Millions		3 Months Ended
	Mar. 01, 2018 USD ($)	Mar. 31, 2019 $ / bbl
Big Spring Pipeline, Storage And Throughput Facilities Agreement | Crude Oil Throughput
Related Party Transaction [Line Items]
Term of agreement		10 years
Big Spring Pipeline, Storage And Throughput Facilities Agreement | Maximum | Crude Oil Throughput
Related Party Transaction [Line Items]
Throughput commitment tariff rate		0.66
Big Spring Pipeline, Storage And Throughput Facilities Agreement | Minimum | Crude Oil Throughput
Related Party Transaction [Line Items]
Throughput commitment tariff rate		0.05
Big Spring Asphalt Services Agreement
Related Party Transaction [Line Items]
Term of agreement		10 years
Big Spring Asphalt Services Agreement | Storage, Throughput Facilities
Related Party Transaction [Line Items]
Throughput commitment tariff rate		8.30
Big Spring Marketing Agreement
Related Party Transaction [Line Items]
Term of agreement		10 years
Big Spring Marketing Agreement | Maximum | Crude Oil Throughput
Related Party Transaction [Line Items]
Throughput commitment tariff rate		0.71
Big Spring Marketing Agreement | Minimum | Crude Oil Throughput
Related Party Transaction [Line Items]
Throughput commitment tariff rate		0.50
Omnibus Agreement | Delek US and affiliates
Related Party Transaction [Line Items]
Related party annual service fee | $	$ 3.9

X

- Definition

Related Party Annual Service Fee

+ References

No definition available.

+ Details

Name:	dk_RelatedPartyAnnualServiceFee
Namespace Prefix:	dk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The term of the agreement. Agreement could be a lease, debt, arrangement, services agreement or other arrangement.

+ References

No definition available.

+ Details

Name:	dk_TermOfAgreement
Namespace Prefix:	dk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Throughput Commitment Tariff Rate

+ References

No definition available.

+ Details

Name:	dk_ThroughputCommitmentTariffRate
Namespace Prefix:	dk_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

X

- 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

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

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=dk_BigSpringPipelineStorageAndThroughputFacilitiesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=dk_CrudeOilPipelineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=dk_BigSpringAsphaltServicesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=dk_StorageThroughputFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=dk_BigSpringMarketingAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=dk_OmnibusAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_AffiliatedEntityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: