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Net Income Per Limited Partner Unit | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |  |
Net Income Per Limited Partner Unit | Net Income (Loss) Per Limited Partner Unit Net income (loss) per unit applicable to common limited partner units is computed by dividing the respective limited partners’ interest in net income (loss) attributable to MPLX LP by the weighted average number of common units outstanding. Because the Partnership has more than one class of participating securities, it uses the two-class method when calculating the net income (loss) per unit applicable to limited partners. The classes of participating securities include common units, general partner units, Preferred units, certain equity-based compensation awards and incentive distribution rights (“IDRs”). As discussed in Note 1, the HST, WHC and MPLXT acquisition was a transfer between entities under common control. As entities under common control with MPC, prior periods were retrospectively adjusted to furnish comparative information. Accordingly, the prior period earnings have been allocated to the general partner and do not affect the net income (loss) per unit calculation. The earnings for the entities acquired under common control will be included in the net income (loss) per unit calculation prospectively as described above. 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.
| 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.
| [1]
[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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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