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Segment Information - Income From Operations Attributable To Operating Segments (Detail) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Feb. 01, 2018 | Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales and other operating revenues | [1] |  | $ 18,694 |  | $ 16,134 |
Sales to related parties |  |  | 172 |  | 154 |
Income from operations |  |  | 440 |  | 291 |
Income from equity method investments |  |  | 86 |  | 57 |
Depreciation and amortization |  |  | 528 |  | 536 |
Capital expenditures and investments | [2] |  | 748 |  | 1,325 |
MarEn Bakken |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Cash paid to acquire equity method investments |  |  |  |  | 500 |
Intersegment Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales and other operating revenues |  |  | 3,011 |  | 2,935 | [3]
Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales and other operating revenues |  |  | 21,877 |  | 19,223 |
Income from operations |  |  | 529 |  | 374 |
Income from equity method investments |  |  | 86 |  | 57 |
Depreciation and amortization | [4] |  | 512 |  | 522 |
Capital expenditures and investments | [5] |  | 712 |  | 1,297 |
Cash paid to acquire equity method investments |  |  | 41 |  | 566 | [6]
Refining & Marketing |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales and other operating revenues |  |  | 13,412 |  | 11,221 |
Sales to related parties |  |  | 170 |  | 152 |
Income from operations |  | $ (181) |  |  |  |
Refining & Marketing | Intersegment Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales and other operating revenues |  |  | 2,379 |  | 2,590 |
Refining & Marketing | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales and other operating revenues |  |  | 15,961 |  | 13,963 |
Income from operations |  |  | (133) |  | (70) |
Income from equity method investments |  |  | 3 |  | 2 |
Depreciation and amortization |  |  | 252 |  | 267 |
Capital expenditures and investments |  |  | 191 |  | 192 |
Speedway |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales and other operating revenues |  |  | 4,569 |  | 4,381 |
Sales to related parties |  |  | 2 |  | 2 |
Speedway | Intersegment Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales and other operating revenues |  |  | 1 |  | 1 |
Speedway | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales and other operating revenues |  |  | 4,572 |  | 4,384 |
Income from operations |  |  | 95 |  | 135 |
Income from equity method investments |  |  | 14 |  | 13 |
Depreciation and amortization |  |  | 79 |  | 64 |
Capital expenditures and investments |  |  | 39 |  | 35 |
Midstream |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales and other operating revenues |  |  | 713 |  | 532 |
Sales to related parties |  |  | 0 |  | 0 |
Income from operations |  | $ 181 |  |  |  |
Midstream | Ozark Pipeline |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Capital expenditures and investments |  |  |  |  | 220 |
Midstream | Intersegment Eliminations |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales and other operating revenues |  |  | 631 |  | 344 |
Midstream | Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales and other operating revenues |  |  | 1,344 |  | 876 |
Income from operations |  |  | 567 | [7] | 309 |
Income from equity method investments |  |  | 69 |  | 42 |
Depreciation and amortization |  |  | 181 |  | 191 |
Capital expenditures and investments |  |  | 482 |  | 1,070 | [8]
Reportable Segment |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales and other operating revenues |  |  | $ 18,694 |  | $ 16,134 |
[1] | The 2018 period reflects an election to present certain taxes on a net basis. See Notes 2 and 3 for further information.
[2] | Capital expenditures include changes in capital accruals, acquisitions and investments in affiliates.
[3] | Management believes intersegment transactions were conducted under terms comparable to those with unaffiliated parties
[4] | Differences between segment totals and MPC totals represent amounts related to unallocated items and are included in “Items not allocated to segments” in the reconciliation below.
[5] | Capital expenditures include changes in capital accruals, acquisitions and investments in affiliates.
[6] | The three months ended March 31, 2017 includes an investment of $500 million in MarEn Bakken related to the Bakken Pipeline system.
[7] | On February 1, 2018, we contributed certain refining logistics assets and fuels distributions services to MPLX. The results of these new businesses are reported in the Midstream segment prospectively from February 1, resulting in a net reduction of $181 million to Refining & Marketing segment results and a net increase to Midstream segment results of the same amount. No effect was given to prior periods as these entities were not considered businesses prior to February 1, 2018.
[8] | The Midstream segment 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 for the three months ended March 31, 2017.

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