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Select Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Summary of Quarterly Financial Data |
|  | 2018 |  | 2017
(In millions, except per unit data) |  | 1st Qtr. |  | 2nd Qtr. |  | 3rd Qtr. |  | 4th Qtr. |  | 1st Qtr. |  | 2nd Qtr. |  | 3rd Qtr. |  | 4th Qtr.
Total revenues and other income |  | $ | 1,420 |  |  | $ | 1,578 |  |  | $ | 1,712 |  |  | $ | 1,715 |  |  | $ | 886 |  |  | $ | 916 |  |  | $ | 980 |  |  | $ | 1,085 |
Income from operations |  | 557 |  |  | 608 |  |  | 672 |  |  | 666 |  |  | 265 |  |  | 280 |  |  | 311 |  |  | 335 |
Net income |  | 423 |  |  | 456 |  |  | 516 |  |  | 439 |  |  | 187 |  |  | 191 |  |  | 217 |  |  | 241 |
Net income attributable to MPLX LP |  | 421 |  |  | 453 |  |  | 510 |  |  | 434 |  |  | 150 |  |  | 190 |  |  | 216 |  |  | 238 |
Net income attributable to MPLX LP per limited partner unit: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common - basic |  | 0.61 |  |  | 0.55 |  |  | 0.62 |  |  | 0.52 |  |  | 0.20 |  |  | 0.26 |  |  | 0.29 |  |  | 0.31 |
Common - diluted |  | 0.61 |  |  | 0.55 |  |  | 0.62 |  |  | 0.52 |  |  | 0.19 |  |  | 0.26 |  |  | 0.29 |  |  | 0.31 |
Subordinated - basic and diluted |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Cash distributions declared per limited partner common unit |  | 0.6175 |  |  | 0.6275 |  |  | 0.6375 |  |  | 0.6475 |  |  | 0.5400 |  |  | 0.5625 |  |  | 0.5875 |  |  | 0.6075 |
Distributions declared: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Limited partner units - Public |  | 179 |  |  | 181 |  |  | 185 |  |  | 187 |  |  | 149 |  |  | 162 |  |  | 170 |  |  | 175 |
Limited partner units - MPC |  | 288 |  |  | 316 |  |  | 322 |  |  | 327 |  |  | 49 |  |  | 56 |  |  | 62 |  |  | 171 |
General partner units - MPC |  | — |  |  | — |  |  | — |  |  | — |  |  | 5 |  |  | 6 |  |  | 7 |  |  | — |
IDRs - MPC |  | — |  |  | — |  |  | — |  |  | — |  |  | 60 |  |  | 70 |  |  | 81 |  |  | — |
Redeemable preferred units |  | 16 |  |  | 20 |  |  | 19 |  |  | 20 |  |  | 16 |  |  | 17 |  |  | 16 |  |  | 16 |
Total distributions declared |  | $ | 483 |  |  | $ | 517 |  |  | $ | 526 |  |  | $ | 534 |  |  | $ | 279 |  |  | $ | 311 |  |  | $ | 336 |  |  | $ | 362 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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