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Segment Information (Segment Adjusted EBITDA to Income (Loss) from Operations before Income Taxes) (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Refining & Renewable Diesel planned turnaround costs $ (275) $ (183) $ (740) $ (831)
Renewable Diesel JV planned turnaround costs [1] (2) 0 (10) 0
Gain on sale of assets 0 151 [2] 0 151 [2]
Depreciation and amortization (789) (838) (1,582) (1,665)
Renewable Diesel JV depreciation and amortization [1] (23) (23) (45) (45)
Net interest and other financial costs (319) (194) (623) (373)
Income before income taxes 1,878 2,328 2,261 3,933
Renewable Diesel        
Segment Reporting Information [Line Items]        
Renewable Diesel JV depreciation and amortization (23) (23) (45) (45)
Operating Segments        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 3,512 3,615 5,679 7,100
Depreciation and amortization (772) (815) (1,547) (1,618)
Operating Segments | Refining & Marketing        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 1,890 2,022 2,379 4,008
Depreciation and amortization (405) (453) (811) (897)
Operating Segments | Midstream        
Segment Reporting Information [Line Items]        
Adjusted EBITDA 1,641 1,620 3,361 3,209
Depreciation and amortization (349) (345) (700) (688)
Operating Segments | Renewable Diesel        
Segment Reporting Information [Line Items]        
Adjusted EBITDA (19) (27) (61) (117)
Depreciation and amortization [3] (18) (17) (36) (33)
Corporate        
Segment Reporting Information [Line Items]        
Costs and expenses, excluding depreciation (226) (200) (418) (404)
Depreciation and amortization $ (17) $ (23) $ (35) $ (47)
[1] Represents MPC’s pro-rata share of expenses from joint ventures included in the Renewable Diesel segment.
[2] Gain from the Whistler Joint Venture Transaction (as defined in Note 4). See Note 4 for additional information
[3] Excludes our pro-rata share of Renewable Diesel JV depreciation and amortization of $23 million, $23 million, $45 million and $45 million in the three months ended June 30, 2025 and 2024 and six months ended June 30, 2025 and 2024, respectively.