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Supplementary Statistics - Supplementary Statistics (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 01, 2017
Feb. 15, 2017
Mar. 31, 2017
Jun. 30, 2016
Mar. 31, 2016
Supplementary Statistics [Line Items]          
Income from operations     $ 292   $ 75
Impairment expense     0   129
Capital expenditures and investments [1]     1,325   684
MarEn Bakken          
Supplementary Statistics [Line Items]          
Cash paid to acquire equity method investments   $ 500      
Midstream          
Supplementary Statistics [Line Items]          
Impairment expense       $ 1 129
Midstream | Ozark Pipeline          
Supplementary Statistics [Line Items]          
Capital expenditures and investments $ 220        
Operating Segments          
Supplementary Statistics [Line Items]          
Income from operations     374   270
Capital expenditures and investments [2]     1,297   643
Cash paid to acquire equity method investments [3]     566   209
Operating Segments | Refining & Marketing          
Supplementary Statistics [Line Items]          
Income from operations [4]     (70)   (86)
Capital expenditures and investments     192   243
Operating Segments | Speedway          
Supplementary Statistics [Line Items]          
Income from operations     135   167
Capital expenditures and investments     35   50
Operating Segments | Midstream          
Supplementary Statistics [Line Items]          
Income from operations [5],[6]     309   189
Capital expenditures and investments     1,070 [7]   350
Corporate and Other          
Supplementary Statistics [Line Items]          
Income from operations [6],[8]     (82)   (65)
Capital expenditures and investments [9]     28   41
Capitalized interest     12   17
Segment Reconciling Items          
Supplementary Statistics [Line Items]          
Pension settlement expenses     0   (1)
Impairment expense     $ 0   $ (129) [10]
[1] Capital expenditures include changes in capital accruals, acquisitions and investments in affiliates.
[2] Capital expenditures include changes in capital accruals, acquisitions (including any goodwill) and investments in affiliates.
[3] The three months ended March 31, 2017 includes an investment of $500 million in MarEn Bakken related to the Bakken Pipeline system. The three months ended March 31, 2016 includes an adjustment of $143 million to the fair value of equity method investments acquired in connection with the MarkWest Merger
[4] We revised our operating segment presentation in the first quarter of 2017 in connection with the contribution of certain terminal, pipeline and storage assets to MPLX. The operating results for these assets, which were previously included in the Refining & Marketing segment, are now included in the Midstream segment. Comparable prior period information has been recast to reflect our revised presentation. The results for the pipeline and storage assets were recast effective January 1, 2015 and the results for the terminal assets were recast effective April 1, 2016. Prior to these dates these assets were not considered businesses and therefore there are no financial results from which to recast segment results.
[5] Corporate overhead expenses attributable to MPLX are included in the Midstream segment. Corporate overhead expenses are not allocated to the Refining & Marketing and Speedway segments.
[6] Corporate overhead expenses attributable to MPLX are included in the Midstream segment. Corporate overhead expenses are not allocated to the Refining & Marketing and Speedway segments.
[7] The three months ended March 31, 2017 includes $220 million for the acquisition of the Ozark pipeline and an investment of $500 million in MarEn Bakken related to the Bakken Pipeline system.
[8] Corporate and other unallocated items consists primarily of MPC’s corporate administrative expenses and costs related to certain non-operating assets, except for corporate overhead expenses attributable to MPLX, which are included in the Midstream segment. Corporate overhead expenses are not allocated to the Refining & Marketing and Speedway segments.
[9] Includes capitalized interest of $12 million and $17 million for the three months ended March 31, 2017 and 2016, respectively
[10] See Note 14 for further information on the impairment of goodwill in the three months ended March 31, 2016.