Name:	mpc_EmbeddedDerivativeRenewalTerm
Namespace Prefix:	mpc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

[Line Items] for Schedule of the inputs used in the fair value measurement of assets and liabilities. This disclosure may include, but is not limited to, the fair value of the asset and liabilities, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. [Table]

No definition available.

Name:	mpc_FairValueInputsAssetsandLiabilitiesQuantitativeInformationLineItems
Namespace Prefix:	mpc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the forward commodity price used as an input to measure fair value.

No definition available.

Name:	mpc_FairValueInputsForwardCommodityPrice
Namespace Prefix:	mpc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Represents the percentage of likelihood of renewal of the commodity contract with embedded derivative.

No definition available.

Name:	mpc_FairValueInputsProbabilityOfRenewal
Namespace Prefix:	mpc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Represents the percentage of likelihood of renewal of the commodity contract with embedded derivative for the second term of the contract.

No definition available.

Name:	mpc_FairValueInputsProbabilityofRenewalSecondTerm
Namespace Prefix:	mpc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CommodityContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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

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