XML 95 R76.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Related Party Agreements and Transactions Related Party Agreements and Transactions (Charges related to Omnibus Agreement) (Details) - MPC - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |
Charges for services received under the omnibus agreement | $ 234 | $ 105 | $ 85
Rental cost of sales - related parties [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Charges for services received under the omnibus agreement | 2 | 1 | 1
Purchases - related parties |  |  |
Related Party Transaction [Line Items] |  |  |
Charges for services received under the omnibus agreement | 164 | 67 | 39
General and Administrative Expense - Related Party [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Charges for services received under the omnibus agreement | $ 68 | $ 37 |
General and administrative expenses |  |  |
Related Party Transaction [Line Items] |  |  |
Charges for services received under the omnibus agreement |  |  | $ 45

X
- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
Name: | us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_RelatedPartyTransactionsByRelatedPartyAxis=mpc_MarathonPetroleumCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=mpc_RentalcostofsalesrelatedpartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=mpc_PurchasesFromRelatedPartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=mpc_GeneralandAdministrativeExpenseRelatedPartyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |