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Segment Information - Income From Operations Attributable To Operating Segments (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Sales and other operating revenues $ 31,043 $ 22,988 $ 92,857 $ 64,171
Income from operations 2,024 1,403 4,735 3,554
Depreciation and amortization 855 555 2,660 1,616
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 6,337 3,719 18,702 10,365
Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 37,380 26,707 111,559 74,536
Income from operations 2,244 1,506 5,265 3,836
Depreciation and amortization 810 538 2,529 1,566
Capital expenditures and investments [1] 1,521 917 4,175 2,514
Refining & Marketing        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 21,437 16,751 65,043 46,635
Refining & Marketing | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 5,100 2,931 15,011 8,181
Refining & Marketing | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 26,537 19,682 80,054 54,816
Income from operations 883 666 1,455 1,558
Depreciation and amortization 397 257 1,235 761
Capital expenditures and investments 561 226 1,385 613
Retail        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 8,677 5,395 24,997 15,231
Retail | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 2 1 6 4
Retail | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 8,679 5,396 25,003 15,235
Income from operations 442 161 1,105 415
Depreciation and amortization 113 76 369 228
Capital expenditures and investments 177 98 370 225
Midstream        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 929 842 2,817 2,305
Midstream | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 1,235 787 3,685 2,180
Midstream | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 2,164 1,629 6,502 4,485
Income from operations 919 679 2,705 1,863
Depreciation and amortization 300 205 925 577
Capital expenditures and investments 783 593 2,420 1,676
Reportable Segment        
Segment Reporting Information [Line Items]        
Sales and other operating revenues [2] $ 31,043 $ 22,988 $ 92,857 $ 64,171
[1]
Capital expenditures include changes in capital accruals and investments in affiliates. See reconciliation from segment totals to MPC consolidated total capital expenditures below.
[2]
Includes related party sales. See Note 6 for additional information.