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Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2017
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
| Three Months Ended June 30, 2017
(In millions) | L&S |  | G&P |  | Total
Revenues and other income: |  |  |  |  |
Segment revenues | $ | 372 |  |  | $ | 603 |  |  | $ | 975 |
Segment other income | 12 |  |  | — |  |  | 12 |
Total segment revenues and other income | 384 |  |  | 603 |  |  | 987 |
Costs and expenses: |  |  |  |  |
Segment cost of revenues | 176 |  |  | 252 |  |  | 428 |
Segment operating income before portion attributable to noncontrolling interests and Predecessor | 208 |  |  | 351 |  |  | 559 |
Segment portion attributable to noncontrolling interests and Predecessor | — |  |  | 38 |  |  | 38 |
Segment operating income attributable to MPLX LP | $ | 208 |  |  | $ | 313 |  |  | $ | 521 |
| Three Months Ended June 30, 2016
(In millions) | L&S |  | G&P |  | Total
Revenues and other income: |  |  |  |  |
Segment revenues | $ | 331 |  |  | $ | 530 |  |  | $ | 861 |
Segment other income | 14 |  |  | — |  |  | 14 |
Total segment revenues and other income | 345 |  |  | 530 |  |  | 875 |
Costs and expenses: |  |  |  |  |
Segment cost of revenues | 142 |  |  | 223 |  |  | 365 |
Segment operating income before portion attributable to noncontrolling interests and Predecessor | 203 |  |  | 307 |  |  | 510 |
Segment portion attributable to noncontrolling interests and Predecessor | 80 |  |  | 36 |  |  | 116 |
Segment operating income attributable to MPLX LP | $ | 123 |  |  | $ | 271 |  |  | $ | 394 |
| Six Months Ended June 30, 2017
(In millions) | L&S |  | G&P |  | Total
Revenues and other income: |  |  |  |  |
Segment revenues | $ | 717 |  |  | $ | 1,200 |  |  | $ | 1,917 |
Segment other income | 24 |  |  | 1 |  |  | 25 |
Total segment revenues and other income | 741 |  |  | 1,201 |  |  | 1,942 |
Costs and expenses: |  |  |  |  |
Segment cost of revenues | 324 |  |  | 505 |  |  | 829 |
Segment operating income before portion attributable to noncontrolling interests and Predecessor | 417 |  |  | 696 |  |  | 1,113 |
Segment portion attributable to noncontrolling interests and Predecessor | 53 |  |  | 74 |  |  | 127 |
Segment operating income attributable to MPLX LP | $ | 364 |  |  | $ | 622 |  |  | $ | 986 |
| Six Months Ended June 30, 2016
(In millions) | L&S |  | G&P |  | Total
Revenues and other income: |  |  |  |  |
Segment revenues | $ | 562 |  |  | $ | 1,028 |  |  | $ | 1,590 |
Segment other income | 30 |  |  | — |  |  | 30 |
Total segment revenues and other income | 592 |  |  | 1,028 |  |  | 1,620 |
Costs and expenses: |  |  |  |  |
Segment cost of revenues | 239 |  |  | 423 |  |  | 662 |
Segment operating income before portion attributable to noncontrolling interests and Predecessor | 353 |  |  | 605 |  |  | 958 |
Segment portion attributable to noncontrolling interests and Predecessor | 142 |  |  | 77 |  |  | 219 |
Segment operating income attributable to MPLX LP | $ | 211 |  |  | $ | 528 |  |  | $ | 739 |
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] |
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions) | 2017 |  | 2016 |  | 2017 |  | 2016
Reconciliation to Income from operations: |  |  |  |  |  |  |
L&S segment operating income attributable to MPLX LP | $ | 208 |  |  | $ | 123 |  |  | $ | 364 |  |  | $ | 211 |
G&P segment operating income attributable to MPLX LP | 313 |  |  | 271 |  |  | 622 |  |  | 528 |
Segment operating income attributable to MPLX LP | 521 |  |  | 394 |  |  | 986 |  |  | 739 |
Segment portion attributable to unconsolidated affiliates | (38 | ) |  | (47 | ) |  | (78 | ) |  | (89 | )
Segment portion attributable to Predecessor | — |  |  | 80 |  |  | 53 |  |  | 142 |
Income (loss) from equity method investments | 1 |  |  | (83 | ) |  | 6 |  |  | (78 | )
Other income - related parties | 14 |  |  | 11 |  |  | 25 |  |  | 18 |
Unrealized derivative gains (losses)(1) | 3 |  |  | (12 | ) |  | 19 |  |  | (21 | )
Depreciation and amortization | (164 | ) |  | (151 | ) |  | (351 | ) |  | (287 | )
Impairment expense | — |  |  | (1 | ) |  | — |  |  | (130 | )
General and administrative expenses | (57 | ) |  | (63 | ) |  | (115 | ) |  | (116 | )
Income from operations | $ | 280 |  |  | $ | 128 |  |  | $ | 545 |  |  | $ | 178 |
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions) | 2017 |  | 2016 |  | 2017 |  | 2016
Reconciliation to Total revenues and other income: |  |  |  |  |  |  |
Total segment revenues and other income | $ | 987 |  |  | $ | 875 |  |  | $ | 1,942 |  |  | $ | 1,620 |
Revenue adjustment from unconsolidated affiliates | (88 | ) |  | (99 | ) |  | (180 | ) |  | (203 | )
Income (loss) from equity method investments | 1 |  |  | (83 | ) |  | 6 |  |  | (78 | )
Other income - related parties | 14 |  |  | 11 |  |  | 25 |  |  | 18 |
Unrealized derivative gains (losses) related to product sales(1) | 2 |  |  | (6 | ) |  | 9 |  |  | (14 | )
Total revenues and other income | $ | 916 |  |  | $ | 698 |  |  | $ | 1,802 |  |  | $ | 1,343 |
Reconciliation of Net Income Attributable to Noncontrolling Interests [Table Text Block] |
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions) | 2017 |  | 2016 |  | 2017 |  | 2016
Reconciliation to Net income attributable to noncontrolling interests and Predecessor: |  |  |  |  |  |  |
Segment portion attributable to noncontrolling interests and Predecessor | $ | 38 |  |  | $ | 116 |  |  | $ | 127 |  |  | $ | 219 |
Portion of noncontrolling interests and Predecessor related to items below segment income from operations | (27 | ) |  | (84 | ) |  | (63 | ) |  | (118 | )
Portion of operating (income) loss attributable to noncontrolling interests of unconsolidated affiliates | (10 | ) |  | 21 |  |  | (26 | ) |  | (2 | )
Net income attributable to noncontrolling interests and Predecessor | $ | 1 |  |  | $ | 53 |  |  | $ | 38 |  |  | $ | 99 |
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Table Text Block] | The following table reconciles segment capital expenditures to total capital expenditures:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(In millions) | 2017 |  | 2016 |  | 2017 |  | 2016
L&S segment capital expenditures | $ | 136 |  |  | $ | 106 |  |  | $ | 233 |  |  | $ | 181 |
G&P segment capital expenditures | 317 |  |  | 212 |  |  | 624 |  |  | 485 |
Total segment capital expenditures | 453 |  |  | 318 |  |  | 857 |  |  | 666 |
Less: Capital expenditures for Partnership-operated, non-wholly-owned subsidiaries in G&P segment | 81 |  |  | 16 |  |  | 205 |  |  | 60 |
Total capital expenditures | $ | 372 |  |  | $ | 302 |  |  | $ | 652 |  |  | $ | 606 |
Reconciliation of Assets from Segment to Consolidated [Table Text Block] | Total assets by reportable segment were:
(In millions) | June 30, 2017 |  | December 31, 2016
Cash and cash equivalents | $ | 293 |  |  | $ | 234 |
L&S | 3,819 |  |  | 2,978 |
G&P | 14,489 |  |  | 14,297 |
Total assets | $ | 18,601 |  |  | $ | 17,509 |

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