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Segment Information - Segment Operating Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |
Segment revenues | $ 191 | $ 137 |  | $ 394 | $ 237 |
Segment other income | 1 | 1 |  | 3 | 3 |
Total segment revenues and other income | 916 | 698 | [1] | 1,802 | 1,343 | [1]
Operating Segments [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Segment revenues | 975 | 861 |  | 1,917 | 1,590 |
Segment other income | 12 | 14 |  | 25 | 30 |
Total segment revenues and other income | 987 | 875 |  | 1,942 | 1,620 |
Segment cost of revenues | 428 | 365 |  | 829 | 662 |
Segment operating income before portion attributable to noncontrolling interests and Predecessor | 559 | 510 |  | 1,113 | 958 |
Segment portion attributable to noncontrolling interests and Predecessor | 38 | 116 |  | 127 | 219 |
Segment operating income attributable to MPLX LP | 521 | 394 |  | 986 | 739 |
Operating Segments [Member] | L&S [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Segment revenues | 372 | 331 |  | 717 | 562 |
Segment other income | 12 | 14 |  | 24 | 30 |
Total segment revenues and other income | 384 | 345 |  | 741 | 592 |
Segment cost of revenues | 176 | 142 |  | 324 | 239 |
Segment operating income before portion attributable to noncontrolling interests and Predecessor | 208 | 203 |  | 417 | 353 |
Segment portion attributable to noncontrolling interests and Predecessor | 0 | 80 |  | 53 | 142 |
Segment operating income attributable to MPLX LP | 208 | 123 |  | 364 | 211 |
Operating Segments [Member] | G&P [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Segment revenues | 603 | 530 |  | 1,200 | 1,028 |
Segment other income | 0 | 0 |  | 1 | 0 |
Total segment revenues and other income | 603 | 530 |  | 1,201 | 1,028 |
Segment cost of revenues | 252 | 223 |  | 505 | 423 |
Segment operating income before portion attributable to noncontrolling interests and Predecessor | 351 | 307 |  | 696 | 605 |
Segment portion attributable to noncontrolling interests and Predecessor | 38 | 36 |  | 74 | 77 |
Segment operating income attributable to MPLX LP | $ 313 | $ 271 |  | $ 622 | $ 528 |
[1] | Financial information has been retrospectively adjusted for the acquisition of HST, WHC and MPLXT from MPC. See Notes 1 and 3.

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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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