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Supplementary Statistics - Operating Statistics (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
MBPD
Jun. 30, 2012
MBPD
Jun. 30, 2013
MBPD
Jun. 30, 2012
MBPD
Operating Statistics [Line Items ]        
MPC Consolidated Refined Product Sales Volumes (thousands of barrels per day) 2,135 [1],[2] 1,591 [1],[2] 2,016 [1],[2] 1,574 [1],[2]
Refining & Marketing [Member]
       
Refinery Throughputs (thousands of barrels per day):        
Crude oil refined 1,690 [2] 1,208 [2] 1,562 [2] 1,177 [2]
Other charge and blendstocks 174 [2] 131 [2] 206 [2] 153 [2]
Total 1,864 [2] 1,339 [2] 1,768 [2] 1,330 [2]
Crude Oil Capacity Utilization percent 99.00% [2],[3] 101.00% [2],[3] 96.00% [2],[3] 99.00% [2],[3]
Refined Product Yields (thousands of barrels per day):        
Gasoline 923 [2] 724 [2] 906 [2] 720 [2]
Distillates 609 [2] 422 [2] 566 [2] 409 [2]
Propane 40 [2] 26 [2] 36 [2] 26 [2]
Feedstocks and special products 240 [2] 102 [2] 212 [2] 116 [2]
Heavy fuel oil 31 [2] 18 [2] 31 [2] 17 [2]
Asphalt 54 [2] 71 [2] 50 [2] 62 [2]
Total 1,897 [2] 1,363 [2] 1,801 [2] 1,350 [2]
Refining & Marketing Refined Product Sales Volume (thousands of barrels per day) 2,125 [2],[4] 1,571 [2],[4] 2,004 [2],[4] 1,551 [2],[4]
Refining & Marketing Gross Margin (dollars per barrel) 6.18 [2],[5] 11.13 [2],[5] 6.99 [2],[5] 9.76 [2],[5]
Turnaround and major maintenance 0.73 [2],[6] 0.88 [2],[6] 0.93 [2],[6] 0.96 [2],[6]
Depreciation and amortization 1.28 [2],[6] 1.39 [2],[6] 1.35 [2],[6] 1.39 [2],[6]
Other manufacturing 4.06 [2],[6],[7] 3.05 [2],[6],[7] 3.94 [2],[6],[7] 3.11 [2],[6],[7]
Total 6.07 [2],[6] 5.32 [2],[6] 6.22 [2],[6] 5.46 [2],[6]
Speedway [Member]
       
Speedway Operating Statistics        
Convenience stores at period-end 1,468 1,455 1,468 1,455
Gasoline & distillate sales (millions of gallons) 781 756 1,526 1,462
Gasoline & distillate gross margin (dollars per gallon) 0.1738 [8] 0.1639 [8] 0.1525 [8] 0.1377 [8]
Merchandise sales (in millions) $ 806 $ 776 $ 1,517 $ 1,471
Merchandise gross margin (in millions) $ 212 $ 203 $ 396 $ 382
Same store gasoline sales volume (period over period) 0.00% 2.10% 0.30% 0.50%
Same store merchandise sales excluding cigarettes (period over period) 4.50% 10.10% 2.80% 10.30%
Pipeline Transportation [Member]
       
Pipeline Transportation Operating Statistics        
Crude oil pipelines 1,334 [9] 1,193 [9] 1,303 [9] 1,157 [9]
Refined products pipelines 959 [9] 954 [9] 939 [9] 935 [9]
Total 2,293 [9] 2,147 [9] 2,242 [9] 2,092 [9]
[1] Total average daily volumes of refined product sales to wholesale, branded and retail (Speedway segment) customers.
[2] Includes the impact of the Galveston Bay Refinery and Related Assets beginning on the February 1, 2013 acquisition date.
[3] Based on calendar day capacity, which is an annual average that includes downtime for planned maintenance and other normal operating activities.
[4] Includes intersegment sales.
[5] Sales revenue less cost of refinery inputs, purchased products and refinery direct operating costs (including turnaround and major maintenance, depreciation and amortization and other manufacturing expenses), divided by Refining & Marketing segment refined product sales volume.
[6] Per barrel of total refinery throughputs.
[7] Includes utilities, labor, routine maintenance and other operating costs.
[8] The price paid by consumers less the cost of refined products, including transportation, consumer excise taxes and bankcard processing fees, divided by gasoline and distillates sales volume.
[9] On owned common-carrier pipelines, excluding equity method investments.