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Segment Information (Tables) | 3 Months Ended
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Mar. 31, 2018
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] | The tables below present information about income from operations and capital expenditures for the reported segments:
| Three Months Ended March 31, 2018
(In millions) | L&S |  | G&P |  | Total
Revenues and other income: |  |  |  |  |
Segment revenues | $ | 646 |  |  | $ | 569 |  |  | $ | 1,215 |
Product related revenues | — |  |  | 249 |  |  | 249 |
Segment other income | 12 |  |  | 6 |  |  | 18 |
Total segment revenues and other income | 658 |  |  | 824 |  |  | 1,482 |
Costs and expenses: |  |  |  |  |
Segment cost of revenues | 234 |  |  | 235 |  |  | 469 |
Purchased product costs | — |  |  | 194 |  |  | 194 |
Segment operating income before portion attributable to noncontrolling interests and Predecessor | 424 |  |  | 395 |  |  | 819 |
Segment portion attributable to noncontrolling interests and Predecessor | — |  |  | 45 |  |  | 45 |
Segment operating income attributable to MPLX LP | $ | 424 |  |  | $ | 350 |  |  | $ | 774 |
| Three Months Ended March 31, 2017
(In millions) | L&S |  | G&P |  | Total
Revenues and other income: |  |  |  |  |
Segment revenues | $ | 345 |  |  | $ | 401 |  |  | $ | 746 |
Product related revenues | — |  |  | 196 |  |  | 196 |
Segment other income | 12 |  |  | 1 |  |  | 13 |
Total segment revenues and other income | 357 |  |  | 598 |  |  | 955 |
Costs and expenses: |  |  |  |  |
Segment cost of revenues | 148 |  |  | 113 |  |  | 261 |
Purchased product costs | — |  |  | 140 |  |  | 140 |
Segment operating income before portion attributable to noncontrolling interests and Predecessor | 209 |  |  | 345 |  |  | 554 |
Segment portion attributable to noncontrolling interests and Predecessor | 53 |  |  | 36 |  |  | 89 |
Segment operating income attributable to MPLX LP | $ | 156 |  |  | $ | 309 |  |  | $ | 465 |
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] |
| Three Months Ended March 31,
(In millions) | 2018 |  | 2017
Reconciliation to Income from operations: |  |  |
Segment operating income attributable to MPLX LP | $ | 774 |  |  | $ | 465 |
Segment portion attributable to unconsolidated affiliates | (53 | ) |  | (40 | )
Segment portion attributable to Predecessor | — |  |  | 53 |
Income from equity method investments | 61 |  |  | 5 |
Other income - related parties | 13 |  |  | 11 |
Unrealized derivative gains(1) | 7 |  |  | 16 |
Depreciation and amortization | (176 | ) |  | (187 | )
General and administrative expenses | (69 | ) |  | (58 | )
Income from operations | $ | 557 |  |  | $ | 265 |
Reconciliation of Revenue from Segments to Consolidated [Table Text Block] |
| Three Months Ended March 31,
(In millions) | 2018 |  | 2017
Reconciliation to Total revenues and other income: |  |  |
Total segment revenues and other income | $ | 1,482 |  |  | $ | 955 |
Revenue adjustment from unconsolidated affiliates | (137 | ) |  | (92 | )
Income from equity method investments | 61 |  |  | 5 |
Other income - related parties | 13 |  |  | 11 |
Unrealized derivative gains related to product sales(1) | 1 |  |  | 7 |
Total revenues and other income | $ | 1,420 |  |  | $ | 886 |
(1) | The Partnership 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.
Reconciliation of Net Income Attributable to Noncontrolling Interests [Table Text Block] |
| Three Months Ended March 31,
(In millions) | 2018 |  | 2017
Reconciliation to Net income attributable to noncontrolling interests and Predecessor: |  |  |
Segment portion attributable to noncontrolling interests and Predecessor | $ | 45 |  |  | $ | 89 |
Portion of noncontrolling interests and Predecessor related to items below segment income from operations | (19 | ) |  | (36 | )
Portion of operating income attributable to noncontrolling interests of unconsolidated affiliates | (24 | ) |  | (16 | )
Net income attributable to noncontrolling interests and Predecessor | $ | 2 |  |  | $ | 37 |
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 March 31,
(In millions) | 2018 |  | 2017
L&S segment capital expenditures | $ | 190 |  |  | $ | 97 |
G&P segment capital expenditures | 319 |  |  | 307 |
Total segment capital expenditures | 509 |  |  | 404 |
Less: Capital expenditures for Partnership-operated, non-wholly-owned subsidiaries in G&P segment | 54 |  |  | 124 |
Total capital expenditures | $ | 455 |  |  | $ | 280 |
Reconciliation of Assets from Segment to Consolidated [Table Text Block] | Total assets by reportable segment were:
(In millions) | March 31, 2018 |  | December 31, 2017
Cash and cash equivalents | $ | 2 |  |  | $ | 5 |
L&S | 5,958 |  |  | 4,611 |
G&P | 15,046 |  |  | 14,884 |
Total assets | $ | 21,006 |  |  | $ | 19,500 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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