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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
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Galveston Bay Refinery and Related Assets [Member]
     
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