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Segment Information - Reconciliation Adjusted EBITDA to Net income (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization | [1] |  |  |  |  |  |  |  |  |  |  | $ 766 | $ 683 | $ 591
Provision/(benefit) for income taxes |  |  |  |  |  |  |  |  |  |  |  | 8 | 1 | (12)
Amortization of deferred financing costs |  |  |  |  |  |  |  |  |  |  |  | 59 | 53 | 46
Extinguishment of Debt, Gain (Loss), Net of Tax |  |  |  |  |  |  |  |  |  |  |  | (46) | 0 | 0
Total compensation expense |  |  |  |  |  |  |  |  |  |  |  | (19) | (15) | (10)
Goodwill and Intangible Asset Impairment |  |  |  |  |  |  |  |  |  | $ (1) | $ (129) | 0 | 0 | (130)
Interest and Other Financial Costs |  |  |  |  |  |  |  |  |  |  |  | 556 | 301 | 215
Income (Loss) from Equity Method Investments | [2],[3] |  |  |  |  |  |  |  |  |  |  | 240 | 78 | (74)
Distributions from unconsolidated affiliates |  |  |  |  |  |  |  |  |  |  |  | 400 | 241 | 148
Unrealized gains/(losses) | [4] |  |  |  |  |  |  |  |  |  |  | 5 | (6) | (36)
Acquisition Costs, Period Cost |  |  |  |  |  |  |  |  |  |  |  | 3 | 11 | 1
Net income |  | $ 439 | $ 516 | $ 456 | $ 423 | $ 241 | $ 217 | $ 191 | $ 187 |  |  | 1,834 | 836 | 434
Logistics and Storage [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | (240) | (163) | (128)
Gathering and Processing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  | (526) | (520) | (463)
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | 3,475 | 2,004 | 1,419
Amortization of deferred financing costs |  |  |  |  |  |  |  |  |  |  |  | 59 | 53 | 46
Operating Segments | Logistics and Storage [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA | [5] |  |  |  |  |  |  |  |  |  |  | 2,057 | 775 | 395
Income (Loss) from Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  | 166 | 36 | 0
Operating Segments | Gathering and Processing [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjusted EBITDA | [5] |  |  |  |  |  |  |  |  |  |  | 1,418 | 1,229 | 1,024
Income (Loss) from Equity Method Investments | [6] |  |  |  |  |  |  |  |  |  |  | 74 | 42 | (74)
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions from unconsolidated affiliates |  |  |  |  |  |  |  |  |  |  |  | 447 | 231 | 150
Adjusted EBITDA attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  | 18 | 8 | 3
Adjusted EBITDA attributable to Predecessor | [7] |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 47 | $ 251
[1] | Depreciation and amortization attributable to L&S was $240 million, $163 million and $128 million for the years ended 2018, 2017 and 2016, respectively. Depreciation and amortization attributable to G&P was $526 million, $520 million and $463 million for 2018, 2017 and 2016, respectively.
[2] | Includes an impairment expense of $89 million related to one of MPLX’s equity method investments for the year ended December 31, 2016.
[3] | “Income/(loss) from equity method investments” includes the impact of any basis differential amortization or accretion.
[4] | MPLX 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.
[5] | See below for the reconciliation from Segment Adjusted EBITDA to “Net income.”
[6] | Includes an impairment expense of $89 million related to one of MPLX’s equity method investments for the year ended December 31, 2016.
[7] | The Adjusted EBITDA adjustments related to Predecessor are excluded from Adjusted EBITDA attributable to MPLX LP prior to the acquisition date.

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