Segment Information (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Income From Operations Attributable To Operating Segments

(In millions)	Refining & Marketing			Speedway		Midstream		Total
Three Months Ended March 31, 2016
Revenues:
Customer	$	8,406		$	3,950	$	399	$	12,755
Intersegment(a)	2,165			1		193		2,359
Segment revenues	$	10,571		$	3,951	$	592	$	15,114
Segment income (loss) from operations(b)	$	(62	)	$	167	$	167	$	272
Income (loss) from equity method investments	(1		)	—		23		22
Depreciation and amortization(c)	273			63		140		476
Capital expenditures and investments(d)	243			50		350		643

(In millions)	Refining & Marketing		Speedway		Midstream		Total
Three Months Ended March 31, 2015
Revenues:
Customer	$	12,644	$	4,531	$	16	$	17,191
Intersegment(a)	2,734		—		187		2,921
Segment revenues	$	15,378	$	4,531	$	203	$	20,112
Segment income from operations(b)	$	1,292	$	168	$	90	$	1,550
Income from equity method investments	6		—		9		15
Depreciation and amortization(c)	261		63		26		350
Capital expenditures and investments(d)	223		45		87		355

^(a)  Management believes intersegment transactions were conducted under terms comparable to those with unaffiliated parties.

^(b)  Corporate overhead expenses attributable to MPLX are included in the Midstream segment. Corporate overhead expenses are not allocated to the Refining & Marketing and Speedway segments.

^(c)  Differences between segment totals and MPC totals represent amounts related to unallocated items and are included in “Items not allocated to segments” in the reconciliation below.

^(d)  Capital expenditures include changes in capital accruals, acquisitions (including any goodwill) and investments in affiliates.

Reconciliation Of Segment Income From Operations To Income Before Income Taxes

The following reconciles segment income from operations to income before income taxes as reported in the consolidated statements of income:

	Three Months Ended   March 31,
(In millions)	2016			2015
Segment income from operations	$	272		$	1,550
Items not allocated to segments:
Corporate and other unallocated items(a)(b)	(67		)	(79		)
Pension settlement expenses(c)	(1		)	(1		)
Impairments(d)	(129		)	—
Net interest and other financial income (costs)	(142		)	(81		)
Income before income taxes	$	(67	)	$	1,389

^(a)  Corporate and other unallocated items consists primarily of MPC’s corporate administrative expenses and costs related to certain non-operating assets.

^(b)  Corporate overhead expenses attributable to MPLX are included in the Midstream segment. Corporate overhead expenses are not allocated to the Refining & Marketing and Speedway segments.

^(c)  See Note 20.

^(d)  See Note 14.

Reconciliation Of Segment Capital Expenditures And Investments To Total Capital Expenditures

The following reconciles segment capital expenditures and investments to total capital expenditures:

	Three Months Ended   March 31,
(In millions)	2016		2015
Segment capital expenditures and investments	$	643	$	355
Less: Investments in equity method investees(a)	209		42
Plus: Items not allocated to segments:
Capital expenditures not allocated to segments	24		21
Capitalized interest	17		8
Total capital expenditures(b)	$	475	$	342

^(a)  The three months ended March 31, 2016 includes an adjustment of $143 million to the fair value of equity investments acquired in connection with the MarkWest Merger. See Note 4.

^(b)  Capital expenditures include changes in capital accruals. See Note 18 for a reconciliation of total capital expenditures to additions to property, plant and equipment as reported in the consolidated statements of cash flows.