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Segment Information - Reconciliation Of Segment Income From Operations To Income Before Income Taxes (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Income from operations $ 1,403 $ 1,577 $ 3,554 $ 2,850
Net interest and other financial income (costs) 240 158 618 465
Income before income taxes 1,163 1,419 2,936 2,385
Operating Segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Income from operations 1,506 1,660 3,836 3,166
Corporate and Other        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Income from operations [1] (103) (85) (283) (251)
Segment Reconciling Items        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Litigation 0 0 0 (86)
Impairments [2] $ 0 $ 2 $ 1 $ 21
[1] Corporate and other unallocated items consists primarily of MPC’s corporate administrative expenses and costs related to certain non-operating assets, except for corporate overhead expenses attributable to MPLX, which are included in the Midstream segment. Corporate overhead expenses are not allocated to the Refining & Marketing and Speedway segments.
[2] Includes MPC’s share of gains from the sale of assets remaining from the canceled Sandpiper pipeline project