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Segment Information - Segment Operating Income (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016		Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Segment revenues	$ 191	$ 137		$ 394	$ 237
Segment other income	1	1		3	3
Total segment revenues and other income	916	698	[1]	1,802	1,343	[1]
Operating Segments [Member]
Segment Reporting Information [Line Items]
Segment revenues	975	861		1,917	1,590
Segment other income	12	14		25	30
Total segment revenues and other income	987	875		1,942	1,620
Segment cost of revenues	428	365		829	662
Segment operating income before portion attributable to noncontrolling interests and Predecessor	559	510		1,113	958
Segment portion attributable to noncontrolling interests and Predecessor	38	116		127	219
Segment operating income attributable to MPLX LP	521	394		986	739
Operating Segments [Member] | L&S [Member]
Segment Reporting Information [Line Items]
Segment revenues	372	331		717	562
Segment other income	12	14		24	30
Total segment revenues and other income	384	345		741	592
Segment cost of revenues	176	142		324	239
Segment operating income before portion attributable to noncontrolling interests and Predecessor	208	203		417	353
Segment portion attributable to noncontrolling interests and Predecessor	0	80		53	142
Segment operating income attributable to MPLX LP	208	123		364	211
Operating Segments [Member] | G&P [Member]
Segment Reporting Information [Line Items]
Segment revenues	603	530		1,200	1,028
Segment other income	0	0		1	0
Total segment revenues and other income	603	530		1,201	1,028
Segment cost of revenues	252	223		505	423
Segment operating income before portion attributable to noncontrolling interests and Predecessor	351	307		696	605
Segment portion attributable to noncontrolling interests and Predecessor	38	36		74	77
Segment operating income attributable to MPLX LP	$ 313	$ 271		$ 622	$ 528
[1] Financial information has been retrospectively adjusted for the acquisition of HST, WHC and MPLXT from MPC. See Notes 1 and 3.

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Amount of operating income or loss attributable to the reportable segments for the period that is attributable to the non-controlling partners of the entity's less than wholly-owned subsidiaries and the Predecessor entity.

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The aggregate cost of goods produced and sold and services rendered during the reporting period.

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