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Segment Information | 3 Months Ended
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Mar. 31, 2018
Segment Reporting [Abstract] |
Segment Reporting Disclosure [Text Block] | Segment Information The Partnership’s chief operating decision maker is the chief executive officer (“CEO”) of its general partner. The CEO reviews the Partnership’s discrete financial information, makes operating decisions, assesses financial performance and allocates resources on a type of service basis. The Partnership has two reportable segments: L&S and G&P. Each of these segments are organized and managed based upon the nature of the products and services it offers.
• | L&S – transports, stores, distributes and markets crude oil and refined petroleum products. Segment information is not included for periods prior to the Joint-Interest Acquisition and the Ozark pipeline acquisitions. See Note 4 for more detail of these acquisitions.
• | G&P – gathers, processes and transports natural gas; gathers, transports, fractionates, stores and markets NGLs.
The Partnership has investments in entities that are accounted for using the equity method of accounting (see Note 5). However, the CEO only views the Partnership-operated equity method investments’ financial information as if those investments were consolidated, in contrast to the non-operated equity method investments. Segment operating income represents income from operations attributable to the reportable segments. Corporate general and administrative expenses, unrealized derivative gains (losses), certain management fees and depreciation and amortization are not allocated to the reportable segments. Management does not consider these items allocable to or controllable by any individual segment and, therefore, excludes these items when evaluating segment performance. Segment results are also adjusted to exclude the portion of income from operations attributable to the noncontrolling interests related to partially-owned entities that are either consolidated or accounted for as equity method investments. Segment operating income attributable to MPLX LP excludes the operating income related to Predecessors of the HST, WHC and MPLXT businesses prior to the dates they were acquired by MPLX LP. 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 |
| 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 |
| 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.
| 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 |
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 |
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 |
Equity method investments included in L&S assets were $1.17 billion at March 31, 2018 and $1.15 billion at December 31, 2017. Equity method investments included in G&P assets were $2.86 billion at March 31, 2018 and December 31, 2017, respectively.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -URI http://asc.fasb.org/topic&trid=2134510 + Details
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