Name:	mpc_MinorityInterestandPredecessorInterestinOperatingIncomeLossLimitedPartnerships
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Segment operating income including the portion attributable to the noncontrolling interest

No definition available.

Name:	mpc_Segmentoperatingincome
Namespace Prefix:	mpc_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Segment operating income attributable to parent

No definition available.

Name:	mpc_Segmentoperatingincomeattributabletoparent
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Data Type:	xbrli:monetaryItemType
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The aggregate cost of goods produced and sold and services rendered during the reporting period.

Name:	us-gaap_CostOfRevenue
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Midstream costs of residue gas, natural gas liquids and condensate. Midstream is a term sometimes used to identify those industry activities that fall between exploration and production (upstream) and refining and marketing (downstream). The term is most often applied to pipeline transportation of crude oil and natural gas.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447

Name:	us-gaap_NaturalGasMidstreamCosts
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The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation.

Name:	us-gaap_OtherOperatingIncome
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Name:	us-gaap_Revenues
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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

Name:	us-gaap_SalesRevenueGoodsNet
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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

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

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.

No definition available.