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Segment Information (Tables)

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Three Months Ended June 30, 2017
(In millions)	L&S				G&P				Total
Revenues and other income:
Segment revenues	$	372			$	603			$	975
Segment other income	12				—				12
Total segment revenues and other income	384				603				987
Costs and expenses:
Segment cost of revenues	176				252				428
Segment operating income before portion attributable to noncontrolling interests and Predecessor	208				351				559
Segment portion attributable to noncontrolling interests and Predecessor	—				38				38
Segment operating income attributable to MPLX LP	$	208			$	313			$	521

	Three Months Ended June 30, 2016
(In millions)	L&S				G&P				Total
Revenues and other income:
Segment revenues	$	331			$	530			$	861
Segment other income	14				—				14
Total segment revenues and other income	345				530				875
Costs and expenses:
Segment cost of revenues	142				223				365
Segment operating income before portion attributable to noncontrolling interests and Predecessor	203				307				510
Segment portion attributable to noncontrolling interests and Predecessor	80				36				116
Segment operating income attributable to MPLX LP	$	123			$	271			$	394

	Six Months Ended June 30, 2017
(In millions)	L&S				G&P				Total
Revenues and other income:
Segment revenues	$	717			$	1,200			$	1,917
Segment other income	24				1				25
Total segment revenues and other income	741				1,201				1,942
Costs and expenses:
Segment cost of revenues	324				505				829
Segment operating income before portion attributable to noncontrolling interests and Predecessor	417				696				1,113
Segment portion attributable to noncontrolling interests and Predecessor	53				74				127
Segment operating income attributable to MPLX LP	$	364			$	622			$	986

	Six Months Ended June 30, 2016
(In millions)	L&S				G&P				Total
Revenues and other income:
Segment revenues	$	562			$	1,028			$	1,590
Segment other income	30				—				30
Total segment revenues and other income	592				1,028				1,620
Costs and expenses:
Segment cost of revenues	239				423				662
Segment operating income before portion attributable to noncontrolling interests and Predecessor	353				605				958
Segment portion attributable to noncontrolling interests and Predecessor	142				77				219
Segment operating income attributable to MPLX LP	$	211			$	528			$	739

Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]

	Three Months Ended June 30,								Six Months Ended June 30,
(In millions)	2017				2016				2017				2016
Reconciliation to Income from operations:
L&S segment operating income attributable to MPLX LP	$	208			$	123			$	364			$	211
G&P segment operating income attributable to MPLX LP	313				271				622				528
Segment operating income attributable to MPLX LP	521				394				986				739
Segment portion attributable to unconsolidated affiliates	(38		)		(47		)		(78		)		(89		)
Segment portion attributable to Predecessor	—				80				53				142
Income (loss) from equity method investments	1				(83		)		6				(78		)
Other income - related parties	14				11				25				18
Unrealized derivative gains (losses)(1)	3				(12		)		19				(21		)
Depreciation and amortization	(164		)		(151		)		(351		)		(287		)
Impairment expense	—				(1		)		—				(130		)
General and administrative expenses	(57		)		(63		)		(115		)		(116		)
Income from operations	$	280			$	128			$	545			$	178

Reconciliation of Revenue from Segments to Consolidated [Table Text Block]

	Three Months Ended June 30,								Six Months Ended June 30,
(In millions)	2017				2016				2017				2016
Reconciliation to Total revenues and other income:
Total segment revenues and other income	$	987			$	875			$	1,942			$	1,620
Revenue adjustment from unconsolidated affiliates	(88		)		(99		)		(180		)		(203		)
Income (loss) from equity method investments	1				(83		)		6				(78		)
Other income - related parties	14				11				25				18
Unrealized derivative gains (losses) related to product sales(1)	2				(6		)		9				(14		)
Total revenues and other income	$	916			$	698			$	1,802			$	1,343

Reconciliation of Net Income Attributable to Noncontrolling Interests [Table Text Block]

	Three Months Ended June 30,								Six Months Ended June 30,
(In millions)	2017				2016				2017				2016
Reconciliation to Net income attributable to noncontrolling interests and Predecessor:
Segment portion attributable to noncontrolling interests and Predecessor	$	38			$	116			$	127			$	219
Portion of noncontrolling interests and Predecessor related to items below segment income from operations	(27		)		(84		)		(63		)		(118		)
Portion of operating (income) loss attributable to noncontrolling interests of unconsolidated affiliates	(10		)		21				(26		)		(2		)
Net income attributable to noncontrolling interests and Predecessor	$	1			$	53			$	38			$	99

Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Table Text Block]

The following table reconciles segment capital expenditures to total capital expenditures:

	Three Months Ended June 30,								Six Months Ended June 30,
(In millions)	2017				2016				2017				2016
L&S segment capital expenditures	$	136			$	106			$	233			$	181
G&P segment capital expenditures	317				212				624				485
Total segment capital expenditures	453				318				857				666
Less: Capital expenditures for Partnership-operated, non-wholly-owned subsidiaries in G&P segment	81				16				205				60
Total capital expenditures	$	372			$	302			$	652			$	606

Reconciliation of Assets from Segment to Consolidated [Table Text Block]

Total assets by reportable segment were:

(In millions)	June 30, 2017				December 31, 2016
Cash and cash equivalents	$	293			$	234
L&S	3,819				2,978
G&P	14,489				14,297
Total assets	$	18,601			$	17,509

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