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Segment Information - Reconciliation to Income from Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Segment portion attributable to Predecessor |  | $ 0 | $ 52 |  | $ 36 |  | $ 98 |
Income (loss) from equity method investments |  | 1 | (83) |  | 6 | [1] | (78) | [1]
Other income - related parties |  | 25 | 24 |  | 47 |  | 45 |
Depreciation and amortization |  | (164) | (151) |  | (351) |  | (287) |
Impairment expense |  | 0 | (1) |  | 0 |  | (130) |
General and administrative expenses |  | (57) | (63) |  | (115) |  | (116) |
Income from operations |  | 280 | 128 | [2] | 545 |  | 178 | [2]
Operating Segments [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Segment operating income attributable to MPLX LP |  | 521 | 394 |  | 986 |  | 739 |
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Segment portion attributable to unconsolidated affiliates |  | (38) | (47) |  | (78) |  | (89) |
Segment portion attributable to Predecessor |  | 0 | 80 |  | 53 |  | 142 |
Other income - related parties |  | 14 | 11 |  | 25 |  | 18 |
Unrealized derivative gains (losses)(1) | [3] | 3 | (12) |  | 19 |  | (21) |
L&S [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Segment operating income attributable to MPLX LP |  | 208 | 123 |  | 364 |  | 211 |
G&P [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |
Segment operating income attributable to MPLX LP |  | $ 313 | $ 271 |  | $ 622 |  | $ 528 |
[1] | Income (loss) from equity method investments includes the impact of any basis differential amortization or accretion.
[2] | Financial information has been retrospectively adjusted for the acquisition of HST, WHC and MPLXT from MPC. See Notes 1 and 3.
[3] | 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

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