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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.

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