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Equity - Net Income Allocation (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Equity [Abstract] |  |  |
Net income attributable to MPLX LP | [1] | $ 421 | $ 150
Less: Preferred unit distributions |  | 16 | 16
General partner's IDRs and other |  |  | 61
Net income attributable to MPLX LP available to general and limited partners |  |  | 73
General partner's two percent GP Interest in net income attributable to MPLX LP |  |  | 1
Less: General partner’s GP interest in net income attributable to MPLX LP |  | $ 0 | $ 62
[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.

X
- Definition Amount of incentive distribution rights earned in cash or stock during the period by a limited partnership general partner, as well as other items to be deducted from net income before calculating the general partner's two percent interest. + References No definition available. + Details
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- Definition Amount of net income allocated to the general partner, excluding incentive distribution rights. + References No definition available. + Details
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- Definition Net income after adjustments for Incentive Distribution Rights of the general partner. + References No definition available. + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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