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Supplementary Statistics - Operating Statistics (Detail)
bbl / d in Thousands, gal in Millions, CFPD in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
Store
bbl / d
CFPD
$ / gal
$ / bbl
gal
Mar. 31, 2016
USD ($)
Store
bbl / d
CFPD
$ / gal
$ / bbl
gal
Operating Statistics [Line Items ]    
MPC Consolidated Refined Product Sales Volumes (thousands of barrels per day) [1] 2,085 2,158
Refining & Marketing    
Refining & Marketing Operating Statistics    
Refining & Marketing refined product sales volume (thousands of barrels per day) [2] 2,070 2,148
Refining & Marketing gross margin (dollars per barrel) | $ / bbl [3],[4] 11.65 9.87
Crude oil capacity utilization percent [5] 83.00% 89.00%
Refinery throughputs (thousands of barrels per day) [6] 1,708 1,774
Sour crude oil throughput percent 67.00% 61.00%
WTI-priced crude oil throughput percent 15.00% 18.00%
Refined product yields (thousands of barrels per day) [6] 1,748 1,810
Inter-refinery transfers 55 82
Refinery direct operating costs (dollars per barrel):    
Planned turnaround and major maintenance | $ / bbl [7] 3.10 2.43
Depreciation and amortization | $ / bbl [7] 1.63 1.54
Other manufacturing | $ / bbl [7],[8] 4.72 4.14
Total | $ / bbl [7] 9.45 8.11
Refining & Marketing | Crude oil refined    
Refining & Marketing Operating Statistics    
Refinery throughputs (thousands of barrels per day) [6] 1,511 1,603
Refining & Marketing | Other charge and blendstocks    
Refining & Marketing Operating Statistics    
Refinery throughputs (thousands of barrels per day) [6] 197 171
Refining & Marketing | Gasoline    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [6] 867 899
Refining & Marketing | Distillates    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [6] 544 571
Refining & Marketing | Propane    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [6] 28 32
Refining & Marketing | Feedstocks and special products    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [6] 224 234
Refining & Marketing | Heavy fuel oil    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [6] 29 30
Refining & Marketing | Asphalt    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [6] 56 44
Refining & Marketing | Gulf Coast:    
Refining & Marketing Operating Statistics    
Refinery throughputs (thousands of barrels per day) [9] 1,072 1,208
Sour crude oil throughput percent 84.00% 75.00%
WTI-priced crude oil throughput percent 4.00% 3.00%
Refined product yields (thousands of barrels per day) [9] 1,104 1,239
Refinery direct operating costs (dollars per barrel):    
Planned turnaround and major maintenance | $ / bbl [7] 4.31 2.62
Depreciation and amortization | $ / bbl [7] 1.35 1.17
Other manufacturing | $ / bbl [7],[8] 4.62 3.74
Total | $ / bbl [7] 10.28 7.53
Refining & Marketing | Gulf Coast: | Crude oil refined    
Refining & Marketing Operating Statistics    
Refinery throughputs (thousands of barrels per day) [9] 850 991
Refining & Marketing | Gulf Coast: | Other charge and blendstocks    
Refining & Marketing Operating Statistics    
Refinery throughputs (thousands of barrels per day) [9] 222 217
Refining & Marketing | Gulf Coast: | Gasoline    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [9] 499 533
Refining & Marketing | Gulf Coast: | Distillates    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [9] 309 375
Refining & Marketing | Gulf Coast: | Propane    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [9] 21 25
Refining & Marketing | Gulf Coast: | Feedstocks and special products    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [9] 243 280
Refining & Marketing | Gulf Coast: | Heavy fuel oil    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [9] 18 18
Refining & Marketing | Gulf Coast: | Asphalt    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [9] 14 8
Refining & Marketing | Midwest:    
Refining & Marketing Operating Statistics    
Refinery throughputs (thousands of barrels per day) [9] 691 648
Sour crude oil throughput percent 45.00% 39.00%
WTI-priced crude oil throughput percent 29.00% 42.00%
Refined product yields (thousands of barrels per day) [9] 699 653
Refinery direct operating costs (dollars per barrel):    
Planned turnaround and major maintenance | $ / bbl [7] 0.98 1.76
Depreciation and amortization | $ / bbl [7] 1.93 2.03
Other manufacturing | $ / bbl [7],[8] 4.50 4.36
Total | $ / bbl [7] 7.41 8.15
Refining & Marketing | Midwest: | Crude oil refined    
Refining & Marketing Operating Statistics    
Refinery throughputs (thousands of barrels per day) [9] 661 612
Refining & Marketing | Midwest: | Other charge and blendstocks    
Refining & Marketing Operating Statistics    
Refinery throughputs (thousands of barrels per day) [9] 30 36
Refining & Marketing | Midwest: | Gasoline    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [9] 368 366
Refining & Marketing | Midwest: | Distillates    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [9] 235 196
Refining & Marketing | Midwest: | Propane    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [9] 8 9
Refining & Marketing | Midwest: | Feedstocks and special products    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [9] 35 34
Refining & Marketing | Midwest: | Heavy fuel oil    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [9] 11 12
Refining & Marketing | Midwest: | Asphalt    
Refining & Marketing Operating Statistics    
Refined product yields (thousands of barrels per day) [9] 42 36
Speedway    
Speedway Operating Statistics(j)    
Convenience stores at period-end | Store 2,731 [10] 2,771
Gasoline and distillate sales (millions of gallons) | gal 1,393 [10] 1,483
Gasoline and distillate gross margin (dollars per gallon) | $ / gal [11] 0.1566 [10] 0.1682
Merchandise sales (in millions) | $ $ 1,127 [10] $ 1,152
Merchandise gross margin (in millions) | $ $ 320 [10] $ 330
Merchandise margin percent 28.40% [10] 28.60%
Same store gasoline sales volume (period over period) percentage (1.00%) 1.00%
Merchandise sales excluding cigarettes (period over period) percentage [12] 2.10% 3.10%
Midstream    
Midstream Operating Statistics    
Crude oil and refined product pipeline throughputs (thousands of barrels per day) [13] 2,888 2,818
Terminal throughput (thousands of barrels per day) [14] 59,793 0
Gathering system throughput (MMcf/d) | CFPD [15] 3,184 3,345
Natural gas processed (MMcf/d) | CFPD [15] 6,132 5,636
C2 and NGLs fractionated (thousands barrels per day) [15] 367 321
[1] Total average daily volumes of refined product sales to wholesale, branded and retail customers.
[2] Includes intersegment sales.
[3] Excludes LCM inventory valuation charge for the first quarter of 2016. Comparable prior period information for gross margin has been recast in connection with the contribution of certain pipeline assets to MPLX on March 1, 2017.
[4] Sales revenue less cost of refinery inputs and purchased products, divided by total refinery throughputs.
[5] Based on calendar day capacity, which is an annual average that includes downtime for planned maintenance and other normal operating activities.
[6] Excludes inter-refinery volumes of 55 mbpd and 82 mbpd for the three months ended March 31, 2017 and 2016, respectively
[7] Per barrel of total refinery throughputs.
[8] Includes utilities, labor, routine maintenance and other operating costs.
[9] Includes inter-refinery transfer volumes.
[10] 41 travel centers contributed to PFJ Southeast, whereas they are reflected in the first quarter 2016 operating statistics.
[11] The price paid by consumers less the cost of refined products, including transportation, consumer excise taxes and bankcard processing fees, divided by gasoline and distillate sales volume.
[12] Excludes cigarettes.
[13] common-carrier pipelines and private pipelines contributed to MPLX, excluding equity method investments.
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[15] Includes amounts related to unconsolidated equity method investments on a 100 percent basis.