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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.