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Net Income Per Limited Partner Unit | 3 Months Ended
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Mar. 31, 2018
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, Series A Convertible Preferred units (the "Preferred units") and certain equity-based compensation awards; and in prior periods, general partner units and IDRs. For the three months ended March 31, 2018, the Partnership had dilutive potential common units consisting of certain equity-based compensation awards. For the three months ended March 31, 2017, 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 months ended March 31, 2018 and March 31, 2017 were less than 1 million.
| Three Months Ended March 31,
(In millions) | 2018 |  | 2017
Net income attributable to MPLX LP | $ | 421 |  |  | $ | 150 |
Less: Limited partners’ distributions declared on Preferred units(1) | 16 |  |  | 16 |
General partner’s distributions declared (including IDRs)(1) | — |  |  | 65 |
Limited partners’ distributions declared on common units (including common units of general partner)(1) | 467 |  |  | 198 |
Undistributed net loss attributable to MPLX LP | $ | (62 | ) |  | $ | (129 | )
(1) | See Note 8 for distribution information.
| Three Months Ended March 31, 2018
(In millions, except per unit data) | 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 | $ | 467 |  |  | $ | 16 |  |  | $ | 483 |
Undistributed net loss attributable to MPLX LP | (62 | ) |  | — |  |  | (62 | )
Net income attributable to MPLX LP(1) | $ | 405 |  |  | $ | 16 |  |  | $ | 421 |
Weighted average units outstanding: |  |  |  |  |
Basic | 661 |  |  | 31 |  |  | 692 |
Diluted | 661 |  |  | 31 |  |  | 692 |
Net income attributable to MPLX LP per limited partner unit: |  |  |  |  |
Basic | $ | 0.61 |  |  |  |  |
Diluted | $ | 0.61 |  |  |  |  |
| Three Months Ended March 31, 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) | $ | 65 |  |  | $ | 198 |  |  | $ | 16 |  |  | $ | 279 |
Undistributed net loss attributable to MPLX LP | (3 | ) |  | (126 | ) |  | — |  |  | (129 | )
Net income attributable to MPLX LP(1) | $ | 62 |  |  | $ | 72 |  |  | $ | 16 |  |  | $ | 150 |
Weighted average units outstanding: |  |  |  |  |  |  |
Basic | 7 |  |  | 362 |  |  | 31 |  |  | 400 |
Diluted | 7 |  |  | 367 |  |  | 31 |  |  | 405 |
Net income attributable to MPLX LP per limited partner unit: |  |  |  |  |  |  |
Basic |  |  | $ | 0.20 |  |  |  |  |  |
Diluted |  |  | $ | 0.19 |  |  |  |  |  |
(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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