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Segment Information - Reconciliation Of Segment Income From Operations To Income Before Income Taxes (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Income from operations $ 1,711 $ 982 $ 2,151 $ 1,273
Net interest and other financial income (costs) 195 158 378 307
Income before income taxes 1,516 824 1,773 966
Operating Segments        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Income from operations 1,801 1,132 2,330 1,506
Corporate and Other        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Income from operations [1] (91) (83) (180) (166)
Segment Reconciling Items        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Litigation 0 (86) 0 (86)
Impairments [2] $ 1 $ 19 $ 1 $ 19
[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