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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Income from operations |  | $ 2,024 | $ 1,403 | $ 4,735 |  | $ 3,554
Net interest and other financial costs |  | 317 | 240 | 945 |  | 618
Income before income taxes |  | 1,707 | 1,163 | 3,790 |  | 2,936
Operating Segments |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Income from operations |  | 2,244 | 1,506 | 5,265 |  | 3,836
Corporate and Other |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Income from operations | [1] | (198) | (99) | (568) |  | (269)
Segment Reconciling Items |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Capline restructuring gain |  | 0 | 0 | 207 | [2] | 0
Transaction-related costs(c) |  | (22) | (4) | (147) | [3] | (14)
Litigation |  | 0 | 0 | (22) |  | 0
Impairments |  | $ 0 | $ 0 | $ 0 |  | $ 1
[1] | Corporate and other unallocated items consist 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 Retail segments.
[2] | See Note 13.
[3] | The transaction-related costs recognized in the 2019 year-to-date period include the recognition of an obligation for employee benefits provided to former Andeavor employees.

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