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Acquisitions - Acquisition of Andeavor (Details) - USD ($) $ in Millions | Oct. 01, 2018 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 21,277 | $ 20,184
Andeavor |  |  |
Business Acquisition [Line Items] |  |  |
Total fair value of consideration transferred | $ 23,460 |  |
Fair value of MPC shares issued | 19,970 |  |
Cash payment to Andeavor stockholders | 3,490 |  |
Goodwill | 17,335 |  |
Goodwill, expected tax deductible amount | 1,000 |  |
Andeavor | Refining & Marketing |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | 5,200 |  |
Andeavor | Midstream |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | 8,100 |  |
Andeavor | Retail |  |  |
Business Acquisition [Line Items] |  |  |
Goodwill | $ 4,000 |  |

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