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Net Income (Loss) Per Limited Partner Unit (Tables) | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Schedule of Net Income Per Limited Partner Unit | Potential common units omitted from the diluted earnings per unit calculation for the years ended December 31, 2018, 2017 and 2016 were less than 1 million.
(In millions) |  | 2018 |  | 2017 |  | 2016
Net income attributable to MPLX LP |  | $ | 1,818 |  |  | $ | 794 |  |  | $ | 233 |
Less: Limited partners’ distributions declared on preferred units(1) |  | 75 |  |  | 65 |  |  | 41 |
General partner’s distributions declared (includes IDRs)(1)(2) |  | — |  |  | 328 |  |  | 205 |
Limited partners’ distributions declared on common units (including common units of general partner)(1) |  | 1,985 |  |  | 895 |  |  | 692 |
Undistributed net loss attributable to MPLX LP |  | $ | (242 | ) |  | $ | (494 | ) |  | $ | (705 | )
(1) | See Note 8 for distribution information.
(2) | Distributions declared on January 25, 2018 on general partner common units issued on February 1, 2018 in exchange for the economic general partner interest, including IDRs, are shown as general partner distributions declared.
Schedule of Basic and Diluted Earnings Per Unit |
|  | 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 |  | $ | 1,985 |  |  | $ | 75 |  |  | $ | 2,060 |
Undistributed net loss attributable to MPLX LP |  | (242 | ) |  | — |  |  | (242 | )
Net income attributable to MPLX LP(1) |  | $ | 1,743 |  |  | $ | 75 |  |  | $ | 1,818 |
Weighted average units outstanding: |  |  |  |  |  |
Basic |  | 761 |  |  |  |  | 761 |
Diluted |  | 761 |  |  |  |  | 761 |
Net income attributable to MPLX LP per limited partner unit: |  |  |  |  |  |
Basic |  | $ | 2.29 |  |  |  |  |
Diluted |  | $ | 2.29 |  |  |  |  |
|  | 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) |  | $ | 328 |  |  | $ | 895 |  |  | $ | 65 |  |  | $ | 1,288 |
Undistributed net loss attributable to MPLX LP |  | (10 | ) |  | (484 | ) |  | — |  |  | (494 | )
Net income attributable to MPLX LP(1) |  | $ | 318 |  |  | $ | 411 |  |  | $ | 65 |  |  | $ | 794 |
Weighted average units outstanding: |  |  |  |  |  |  |  |
Basic |  | 8 |  |  | 385 |  |  |  |  | 393 |
Diluted |  | 8 |  |  | 388 |  |  |  |  | 396 |
Net income attributable to MPLX LP per limited partner unit: |  |  |  |  |  |  |  |
Basic |  |  |  | $ | 1.07 |  |  |  |  |
Diluted |  |  |  | $ | 1.06 |  |  |  |  |
|  | 2016
(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: |  |  |  |  |  |  |  |
Distribution declared |  | $ | 205 |  |  | $ | 692 |  |  | $ | 41 |  |  | $ | 938 |
Undistributed net loss attributable to MPLX LP |  | (14 | ) |  | (691 | ) |  | — |  |  | (705 | )
Net income attributable to MPLX LP(1) |  | $ | 191 |  |  | $ | 1 |  |  | $ | 41 |  |  | $ | 233 |
Weighted average units outstanding: |  |  |  |  |  |  |  |
Basic |  | 7 |  |  | 331 |  |  |  |  | 338 |
Diluted |  | 7 |  |  | 338 |  |  |  |  | 345 |
Net income attributable to MPLX LP per limited partner unit: |  |  |  |  |  |  |  |
Basic |  |  |  | $ | — |  |  |  |  |
Diluted |  |  |  | $ | — |  |  |  |  |
(1) | Allocation of net income/(loss) attributable to MPLX LP assumes all earnings for the period were distributed based on the current period distribution priorities.

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