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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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