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Segment Information (Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Segment capital expenditures and investments $ 4,738mpc_CapitalExpendituresAndInvestments [1],[2] $ 2,789mpc_CapitalExpendituresAndInvestments [1],[2] $ 1,460mpc_CapitalExpendituresAndInvestments [1],[2]
Plus: Items not allocated to segments:      
Total capital expenditures 4,325mpc_CapitalExpenditure [1],[3] 2,665mpc_CapitalExpenditure [1],[3] 1,432mpc_CapitalExpenditure [1],[3]
Operating Segments      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Segment capital expenditures and investments 4,628mpc_CapitalExpendituresAndInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 [4],[5] 2,624mpc_CapitalExpendituresAndInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 [4],[6] 1,256mpc_CapitalExpendituresAndInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 [4]
Less: Investments in equity method investees 413us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 124us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 28us-gaap_PaymentsToAcquireEquityMethodInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Corporate and Other      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Segment capital expenditures and investments 110mpc_CapitalExpendituresAndInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember		 [7] 165mpc_CapitalExpendituresAndInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember		 [7] 204mpc_CapitalExpendituresAndInvestments
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember		 [7]
Plus: Items not allocated to segments:      
Capital expenditures not allocated to segments 83mpc_CapitalExpendituresExcludingCapitalizedInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember		 137mpc_CapitalExpendituresExcludingCapitalizedInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember		 103mpc_CapitalExpendituresExcludingCapitalizedInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
Capitalized interest $ 27us-gaap_InterestPaidCapitalized
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember		 $ 28us-gaap_InterestPaidCapitalized
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember		 $ 101us-gaap_InterestPaidCapitalized
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
[1] Capital expenditures include changes in capital accruals.
[2] Includes $2.71 billion in 2014 for the acquisition of Hess’ Retail Operations and Related Assets and $1.36 billion in 2013 for the acquisition of the Galveston Bay Refinery and Related Assets. See Note 5 to the audited consolidated financial statements.
[3] See Note 21 for a reconciliation of total capital expenditures to additions to property, plant and equipment as reported in the consolidated statements of cash flows.
[4] Capital expenditures include changes in capital accruals, acquisitions and investments in affiliates.
[5] The Speedway and Refining & Marketing segments include $2.66 billion and $52 million, respectively, for the acquisition of Hess’ Retail Operations and Related Assets. See Note 5.
[6] The Refining & Marketing and Pipeline Transportation segments include $1.29 billion and $70 million, respectively, for the acquisition of the Galveston Bay Refinery and Related Assets. See Note 5.
[7] Includes capitalized interest of $27 million, $28 million and $101 million for 2014, 2013 and 2012, respectively.