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Segment Information - Segment Operating Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Service revenue | $ 382 |  | $ 260
Segment revenues | 207 | [1] | 203
Segment other income | 4 |  | 3
Total segment revenues and other income | 1,420 |  | 886
Purchased product costs | 187 |  | 131
L&S |  |  |
Segment Reporting Information [Line Items] |  |  |
Service revenue | 28 |  |
G&P |  |  |
Segment Reporting Information [Line Items] |  |  |
Service revenue | 354 |  |
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Service revenue | 1,215 |  | 746
Segment revenues | 249 |  | 196
Segment other income | 18 |  | 13
Total segment revenues and other income | 1,482 |  | 955
Segment cost of revenues | 469 |  | 261
Purchased product costs | 194 |  | 140
Segment operating income before portion attributable to noncontrolling interests and Predecessor | 819 |  | 554
Segment portion attributable to noncontrolling interests and Predecessor | 45 |  | 89
Segment operating income attributable to MPLX LP | 774 |  | 465
Operating Segments | L&S |  |  |
Segment Reporting Information [Line Items] |  |  |
Service revenue | 646 |  | 345
Segment revenues | 0 |  | 0
Segment other income | 12 |  | 12
Total segment revenues and other income | 658 |  | 357
Segment cost of revenues | 234 |  | 148
Purchased product costs | 0 |  | 0
Segment operating income before portion attributable to noncontrolling interests and Predecessor | 424 |  | 209
Segment portion attributable to noncontrolling interests and Predecessor | 0 |  | 53
Segment operating income attributable to MPLX LP | 424 |  | 156
Operating Segments | G&P |  |  |
Segment Reporting Information [Line Items] |  |  |
Service revenue | 569 |  | 401
Segment revenues | 249 |  | 196
Segment other income | 6 |  | 1
Total segment revenues and other income | 824 |  | 598
Segment cost of revenues | 235 |  | 113
Purchased product costs | 194 |  | 140
Segment operating income before portion attributable to noncontrolling interests and Predecessor | 395 |  | 345
Segment portion attributable to noncontrolling interests and Predecessor | 45 |  | 36
Segment operating income attributable to MPLX LP | $ 350 |  | $ 309
[1] | G&P “Product sales” exclude approximately $1 million of revenue related to derivative gains/losses and mark-to-market adjustments.

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- Definition Amount of operating income or loss attributable to the reportable segments for the period that is attributable to the non-controlling partners of the entity's less than wholly-owned subsidiaries and the Predecessor entity. + References No definition available. + Details
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