XML 75 R61.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Acquisitions and Investments - Formation of Travel Plaza Joint Venture (Details) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) | [1] | Dec. 31, 2016 USD ($) Store | Mar. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Contribution of assets to joint venture | $ 328 |  | $ 0
PFJ Southeast |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of travel plazas | Store |  | 123 |
Contribution of assets to joint venture |  | $ 273 |
PFJ Southeast | Property, Plant and Equipment |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Contribution of assets to joint venture |  | 203 |
PFJ Southeast | Goodwill |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Contribution of assets to joint venture |  | 62 |
PFJ Southeast | Inventories |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Contribution of assets to joint venture |  | $ 8 |
PFJ Southeast | Speedway |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of travel plazas | Store |  | 41 |
PFJ Southeast | Pilot Flying J |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of travel plazas | Store |  | 82 |
[1] | MarkWest’s contribution of assets to Sherwood Midstream and Sherwood Midstream Holdings. See Note 4.

X
- Definition Value of property contributed in noncash investing and financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 + Details
Name: | us-gaap_ContributionOfProperty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of stores. + References No definition available. + Details
Name: | us-gaap_NumberOfStores
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=mpc_PFJSoutheastLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_PropertyPlantAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_GoodwillMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_InventoriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=mpc_SpeedwayMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=mpc_PilotFlyingJMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |