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Equity - Net Income Allocation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Stockholders Equity [Line Items] |  |  |  |  |
Net income (loss) attributable to MPLX LP | [1] | $ 190 | $ 19 | $ 340 | $ (41)
Preferred unit distributions |  | (311) | (231) | (590) | (431)
General partner's incentive distribution rights and other |  | 72 | 47 | 133 | 88
Net income (loss) attributable to MPLX LP available to general and limited partners |  | 101 | (37) | 174 | (138)
General partner's two percent GP Interest in net income (loss) attributable to MPLX LP |  | 2 | (1) | 3 | (3)
Less: General partner’s interest in net income attributable to MPLX LP |  | 74 | 46 | 136 | 85
Preferred Units |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |
Net income (loss) attributable to MPLX LP | [1] | 17 | 9 | 33 | 9
Preferred unit distributions | [2] | $ (17) | $ (9) | $ (33) | $ (9)
[1] | Allocation of net income (loss) attributable to MPLX LP assumes all earnings for the period had been distributed based on the current period distribution priorities.
[2] | See Note 7 for distribution information.

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- Definition Amount of equity impact of cash distribution declared to unit-holder of limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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