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Segment Information (Income From Operations Attributable To Operating Segments) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]        
Sales and other operating revenues $ 15,024 $ 33,529 $ 40,239 $ 61,782
Income from operations 981 2,042 (10,836) 2,711
Depreciation and amortization 935 886 1,897 1,805
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 3,004 6,686 7,865 12,336
Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 18,028 40,215 48,104 74,118
Income from operations (256) 2,277 546 3,021
Depreciation and amortization [1] 895 859 1,812 1,719
Capital expenditures and investments [2] 762 1,364 1,771 2,654
Refining & Marketing        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 9,441 23,654 26,969 43,574
Refining & Marketing | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 1,834 5,466 5,451 9,882
Refining & Marketing | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 11,275 29,120 32,420 53,456
Income from operations (1,619) 906 (2,241) 572
Depreciation and amortization 433 411 880 838
Capital expenditures and investments 263 430 722 824
Retail        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 4,778 8,944 11,547 16,320
Retail | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 1 2 3 4
Retail | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 4,779 8,946 11,550 16,324
Income from operations 494 493 1,013 663
Depreciation and amortization 132 130 257 256
Capital expenditures and investments 74 120 150 193
Midstream        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 805 931 1,723 1,888
Midstream | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 1,169 1,218 2,411 2,450
Midstream | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 1,974 2,149 4,134 4,338
Income from operations 869 878 1,774 1,786
Depreciation and amortization 330 318 675 625
Capital expenditures and investments 425 814 899 1,637
Reportable Segment        
Segment Reporting Information [Line Items]        
Sales and other operating revenues [3] $ 15,024 $ 33,529 $ 40,239 $ 61,782
[1]
Differences between segment totals and MPC consolidated totals represent amounts related to corporate and other items not allocated to segments.
[2]
Includes changes in capital expenditure accruals and investments in affiliates. See reconciliation from segment totals to MPC consolidated total capital expenditures below.
[3]
Includes related party sales. See Note 6 for additional information.