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Net Income Per Limited Partner Unit (Tables) | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Schedule of Distributions By Partner By Class | For the three and six months ended June 30, 2017 and 2016, the Partnership had dilutive potential common units consisting of certain equity-based compensation awards and Class B units. Potential common units omitted from the diluted earnings per unit calculation for the three and six months ended June 30, 2017 were less than one million and for three and six months ended June 30, 2016 were approximately 10 million.
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions) | 2017 |  | 2016 |  | 2017 |  | 2016
Net income (loss) attributable to MPLX LP | $ | 190 |  |  | $ | 19 |  |  | $ | 340 |  |  | $ | (41 | )
Less: Limited partners’ distributions declared on Preferred units(1) | 17 |  |  | 9 |  |  | 33 |  |  | 9 |
General partner’s distributions declared (including IDRs)(1) | 76 |  |  | 50 |  |  | 141 |  |  | 94 |
Limited partners’ distributions declared on common units(1) | 218 |  |  | 172 |  |  | 416 |  |  | 328 |
Undistributed net loss attributable to MPLX LP | $ | (121 | ) |  | $ | (212 | ) |  | $ | (250 | ) |  | $ | (472 | )
(1) | See Note 7 for distribution information.
Schedule of Basic and Diluted Earnings Per Unit |
| Three Months Ended June 30, 2017
(In millions, except per unit data) | General Partner |  | Limited Partners’ Common Units |  | Redeemable Preferred Units |  | Total
Basic and diluted net income attributable to MPLX LP per unit: |  |  |  |  |  |  |
Net income attributable to MPLX LP: |  |  |  |  |  |  |
Distributions declared (including IDRs) | $ | 76 |  |  | $ | 218 |  |  | $ | 17 |  |  | $ | 311 |
Undistributed net loss attributable to MPLX LP | (2 | ) |  | (119 | ) |  | — |  |  | (121 | )
Net income attributable to MPLX LP(1) | $ | 74 |  |  | $ | 99 |  |  | $ | 17 |  |  | $ | 190 |
Weighted average units outstanding: |  |  |  |  |  |  |
Basic | 8 |  |  | 377 |  |  | 31 |  |  | 416 |
Diluted | 8 |  |  | 382 |  |  | 31 |  |  | 421 |
Net income attributable to MPLX LP per limited partner unit: |  |  |  |  |  |  |
Basic |  |  | $ | 0.26 |  |  |  |  |
Diluted |  |  | $ | 0.26 |  |  |  |  |
| Three Months Ended June 30, 2016
(In millions, except per unit data) | General Partner |  | Limited Partners’ Common Units |  | Redeemable Preferred Units |  | Total
Basic and diluted net income (loss) attributable to MPLX LP per unit: |  |  |  |  |  |  |
Net income (loss) attributable to MPLX LP: |  |  |  |  |  |  |
Distributions declared (including IDRs) | $ | 50 |  |  | $ | 172 |  |  | $ | 9 |  |  | $ | 231 |
Undistributed net loss attributable to MPLX LP | (5 | ) |  | (207 | ) |  | — |  |  | (212 | )
Net income (loss) attributable to MPLX LP(1) | $ | 45 |  |  | $ | (35 | ) |  | $ | 9 |  |  | $ | 19 |
Weighted average units outstanding: |  |  |  |  |  |  |
Basic | 7 |  |  | 331 |  |  | 17 |  |  | 355 |
Diluted | 7 |  |  | 331 |  |  | 17 |  |  | 355 |
Net loss attributable to MPLX LP per limited partner unit: |  |  |  |  |  |  |
Basic |  |  | $ | (0.11 | ) |  |  |  |  |
Diluted |  |  | $ | (0.11 | ) |  |  |  |  |
| Six Months Ended June 30, 2017
(In millions, except per unit data) | General Partner |  | Limited Partners’ Common Units |  | Redeemable Preferred Units |  | Total
Basic and diluted net income attributable to MPLX LP per unit: |  |  |  |  |  |  |
Net income attributable to MPLX LP: |  |  |  |  |  |  |
Distributions declared (including IDRs) | $ | 141 |  |  | $ | 416 |  |  | $ | 33 |  |  | $ | 590 |
Undistributed net loss attributable to MPLX LP | (5 | ) |  | (245 | ) |  | — |  |  | (250 | )
Net income attributable to MPLX LP(1) | $ | 136 |  |  | $ | 171 |  |  | $ | 33 |  |  | $ | 340 |
Weighted average units outstanding: |  |  |  |  |  |  |
Basic | 8 |  |  | 370 |  |  | 31 |  |  | $ | 409 |
Diluted | 8 |  |  | 374 |  |  | 31 |  |  | 413 |
Net income attributable to MPLX LP per limited partner unit: |  |  |  |  |  |  |
Basic |  |  | $ | 0.46 |  |  |  |  |
Diluted |  |  | $ | 0.46 |  |  |  |  |
| Six Months Ended June 30, 2016
(In millions, except per unit data) | General Partner |  | Limited Partners’ Common Units |  | Redeemable Preferred Units |  | Total
Basic and diluted net income (loss) attributable to MPLX LP per unit: |  |  |  |  |  |  |
Net income (loss) attributable to MPLX LP: |  |  |  |  |  |  |
Distributions declared (including IDRs) | $ | 94 |  |  | $ | 328 |  |  | $ | 9 |  |  | $ | 431 |
Undistributed net loss attributable to MPLX LP | (9 | ) |  | (463 | ) |  | — |  |  | (472 | )
Net income (loss) attributable to MPLX LP(1) | $ | 85 |  |  | $ | (135 | ) |  | $ | 9 |  |  | $ | (41 | )
Weighted average units outstanding: |  |  |  |  |  |  |
Basic | 7 |  |  | 316 |  |  | 8 |  |  | 331 |
Diluted | 7 |  |  | 316 |  |  | 8 |  |  | 331 |
Net loss attributable to MPLX LP per limited partner unit: |  |  |  |  |  |  |
Basic |  |  | $ | (0.43 | ) |  |  |  |  |
Diluted |  |  | $ | (0.43 | ) |  |  |  |  |
(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.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: 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 + Details
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