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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Segment Reporting [Abstract] |
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Table Text Block] | The table below provides a reconciliation between “Net income” and Segment Adjusted EBITDA.
(In millions) |  | 2018 |  | 2017 |  | 2016
Reconciliation to Net income: |  |  |  |  |  |
L&S Segment Adjusted EBITDA |  | $ | 2,057 |  |  | $ | 775 |  |  | $ | 395 |
G&P Segment Adjusted EBITDA |  | 1,418 |  |  | 1,229 |  |  | 1,024 |
Total reportable segments |  | 3,475 |  |  | 2,004 |  |  | 1,419 |
Depreciation and amortization(1) |  | (766 | ) |  | (683 | ) |  | (591 | )
(Provision)/benefit for income taxes |  | (8 | ) |  | (1 | ) |  | 12 |
Amortization of deferred financing costs |  | (59 | ) |  | (53 | ) |  | (46 | )
Loss on extinguishment of debt |  | (46 | ) |  | — |  |  | — |
Non-cash equity-based compensation |  | (19 | ) |  | (15 | ) |  | (10 | )
Impairment expense |  | — |  |  | — |  |  | (130 | )
Net interest and other financial costs |  | (556 | ) |  | (301 | ) |  | (215 | )
Income/(loss) from equity method investments(2) |  | 240 |  |  | 78 |  |  | (74 | )
Distributions/adjustments related to equity method investments |  | (447 | ) |  | (231 | ) |  | (150 | )
Unrealized derivative gains/(losses)(3) |  | 5 |  |  | (6 | ) |  | (36 | )
Acquisition costs |  | (3 | ) |  | (11 | ) |  | 1 |
Adjusted EBITDA attributable to noncontrolling interests |  | 18 |  |  | 8 |  |  | 3 |
Adjusted EBITDA attributable to Predecessor(4) |  | — |  |  | 47 |  |  | 251 |
Net income |  | $ | 1,834 |  |  | $ | 836 |  |  | $ | 434 |
(1) | Depreciation and amortization attributable to L&S was $240 million, $163 million and $128 million for the years ended 2018, 2017 and 2016, respectively. Depreciation and amortization attributable to G&P was $526 million, $520 million and $463 million for 2018, 2017 and 2016, respectively.
(2) | Includes an impairment expense of $89 million related to one of MPLX’s equity method investments for the year ended December 31, 2016.
(3) | MPLX makes a distinction between realized or unrealized gains and losses on derivatives. During the period when a derivative contract is outstanding, changes in the fair value of the derivative are recorded as an unrealized gain or loss. When a derivative contract matures or is settled, the previously recorded unrealized gain or loss is reversed and the realized gain or loss of the contract is recorded.
(4) | The Adjusted EBITDA adjustments related to Predecessor are excluded from Adjusted EBITDA attributable to MPLX LP prior to the acquisition date.
Reconciliation of Assets from Segment to Consolidated [Table Text Block] |
|  | December 31,
(In millions) |  | 2018 |  | 2017
Segment Assets |  |  |  |
Cash and cash equivalents |  | $ | 68 |  |  | $ | 5 |
L&S(1) |  | 6,566 |  |  | 4,611 |
G&P(1) |  | 16,145 |  |  | 14,884 |
Total assets |  | $ | 22,779 |  |  | $ | 19,500 |
(1) | Equity method investments included in L&S assets were $1.12 billion at December 31, 2018 and $1.15 billion at December 31, 2017. Equity method investments included in G&P assets were $3.05 billion at December 31, 2018 and $2.86 billion at December 31, 2017.
Schedule of Segment Reporting Information, by Segment [Table Text Block] | The tables below present information about revenues and other income, capital expenditures and total assets for our reportable segments:
(In millions) |  | 2018 |  | 2017 |  | 2016
L&S |  |  |  |  |  |
Service revenue |  | $ | 2,289 |  |  | $ | 1,200 |  |  | $ | 1,006 |
Rental income |  | 725 |  |  | 279 |  |  | 235 |
Product related revenue |  | 14 |  |  | — |  |  | — |
Income from equity method investments |  | 166 |  |  | 36 |  |  | — |
Other income |  | 46 |  |  | 47 |  |  | 53 |
Total segment revenues and other income(1) |  | 3,240 |  |  | 1,562 |  |  | 1,294 |
Segment Adjusted EBITDA(2) |  | 2,057 |  |  | 775 |  |  | 395 |
Maintenance capital expenditures |  | 104 |  |  | 79 |  |  | 58 |
Growth capital expenditures |  | 452 |  |  | 433 |  |  | 493 |
G&P |  |  |  |  |  |
Service revenue |  | 1,574 |  |  | 1,038 |  |  | 888 |
Rental income |  | 342 |  |  | 277 |  |  | 298 |
Product related revenue |  | 1,135 |  |  | 897 |  |  | 583 |
Income/(loss) from equity method investments(3) |  | 74 |  |  | 42 |  |  | (74 | )
Other income |  | 60 |  |  | 51 |  |  | 40 |
Total segment revenues and other income(1) |  | 3,185 |  |  | 2,305 |  |  | 1,735 |
Segment Adjusted EBITDA(2) |  | 1,418 |  |  | 1,229 |  |  | 1,024 |
Maintenance capital expenditures |  | 42 |  |  | 24 |  |  | 26 |
Growth capital expenditures |  | $ | 1,432 |  |  | $ | 948 |  |  | $ | 720 |
(1) Within the total segment revenues and other income amounts presented above, third party revenues for the L&S segment were $313 million, $160 million and $77 million for 2018, 2017 and 2016, respectively. Third party revenues for the G&P segment were $3,087 million, $2,246 million and $1,684 million for 2018, 2017 and 2016, respectively.
(2) | See below for the reconciliation from Segment Adjusted EBITDA to “Net income.”
(3) | Includes an impairment expense of $89 million related to one of MPLX’s equity method investments for the year ended December 31, 2016.

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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