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Segment Information (Depreciation and Amortization) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Depreciation and amortization $ 789 $ 838 $ 1,582 $ 1,665
Renewable Diesel JV depreciation and amortization [1] 23 23 45 45
Renewable Diesel        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Renewable Diesel JV depreciation and amortization 23 23 45 45
Operating Segments        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Depreciation and amortization 772 815 1,547 1,618
Operating Segments | Refining & Marketing        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Depreciation and amortization 405 453 811 897
Operating Segments | Midstream        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Depreciation and amortization 349 345 700 688
Operating Segments | Renewable Diesel        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
Depreciation and amortization [2] 18 17 36 33
Corporate        
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]        
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] 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.