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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.

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