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Segment Information (Segment Expenses) (Details) - 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]        
Costs and expenses $ 31,904 $ 35,840 $ 63,067 $ 67,267
Operating Segments | Refining & Marketing        
Segment Reporting Information [Line Items]        
Cost of purchases 26,558 30,914 52,216 56,839
Operating costs 1,486 1,363 2,958 2,828
Distribution costs 1,537 1,494 3,015 2,909
Other segment items [1] 366 415 771 655
Costs and expenses 29,947 34,186 58,960 63,231
Operating Segments | Midstream        
Segment Reporting Information [Line Items]        
Other segment items [2] 1,361 1,291 2,760 2,507
Costs and expenses 1,361 1,291 2,760 2,507
Operating Segments | Renewable Diesel        
Segment Reporting Information [Line Items]        
Operating costs 66 59 136 126
Distribution costs 25 19 47 51
Other segment items [3] 579 460 1,171 981
Costs and expenses $ 670 $ 538 $ 1,354 $ 1,158
[1] Other segment items for the Refining & Marketing segment include costs that are reimbursed by customers through commercial arrangements, as well as LIFO inventory adjustments.
[2] Other segment items for the Midstream segment include operating expenses and purchased product costs. For purposes of managing the Midstream segment of MPC, the CODM is only provided consolidated Midstream expense information.
[3] Other segment items for the Renewable Diesel segment include purchased product costs.