Acquisitions - Schedule of Acquisition Related Pro Forma Financial Information (Detail) (Galveston Bay Refinery and Related Assets [Member], USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 6 Months Ended | |
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Galveston Bay Refinery and Related Assets [Member]
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Business Acquisition [Line Items] | |||
Sales and other operating revenues (including consumer excise taxes) | $ 25,508 | $ 50,971 | $ 50,826 |
Net income attributable to MPC | $ 804 | $ 1,373 | $ 1,268 |
Net income attributable to MPC per share - basic (in USD per share) | $ 2.36 | $ 4.21 | $ 3.69 |
Net income attributable to MPC per share - diluted (in USD per share) | $ 2.36 | $ 4.19 | $ 3.66 |