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Segment Information - Revenues and Adjusted EBITDA (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
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total segment revenues and other income $ 1,715 $ 1,712 $ 1,578 $ 1,420 $ 1,085 $ 980 $ 916 $ 886 $ 6,425 $ 3,867 $ 3,029
Revenue from Contract with Customer, Excluding Assessed Tax                 5,007    
Rental income                 349 277 298
Income (Loss) from Equity Method Investments [1],[2]                 240 78 (74)
Other income                 7 6 7
Revenues [3]                 5 (6) (36)
Ohio Condensate                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Impairment related to equity method investment from asset impairment and elimination of basis differential                     89
Operating Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Adjusted EBITDA                 3,475 2,004 1,419
Logistics and Storage [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 2,303    
Logistics and Storage [Member] | Operating Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total segment revenues and other income [4]                 3,240 1,562 1,294
Rental income                 725 279 235
Income (Loss) from Equity Method Investments                 166 36 0
Other income                 46 47 53
Adjusted EBITDA [5]                 2,057 775 395
Growth Capital Expenditures                 452 433 493
Maintenance Capital Expenditures                 104 79 58
Gathering and Processing [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 2,704    
Gathering and Processing [Member] | Operating Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total segment revenues and other income [4]                 3,185 2,305 1,735
Rental income                 342 277 298
Income (Loss) from Equity Method Investments [6]                 74 42 (74)
Other income                 60 51 40
Adjusted EBITDA [5]                 1,418 1,229 1,024
Growth Capital Expenditures                 1,432 948 720
Maintenance Capital Expenditures                 42 24 26
Service [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 1,704 1,156 958
Service [Member] | Logistics and Storage [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 130    
Service [Member] | Logistics and Storage [Member] | Operating Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 2,289 1,200 1,006
Service [Member] | Gathering and Processing [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 1,574    
Service [Member] | Gathering and Processing [Member] | Operating Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 1,574 1,038 888
Product [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 902 889 572
Product [Member] | Logistics and Storage [Member] | Operating Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 14 0 0
Product [Member] | Gathering and Processing [Member] | Operating Segments                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Revenue from Contract with Customer, Excluding Assessed Tax                 1,135 897 583
Third Party | Logistics and Storage [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total segment revenues and other income                 313 160 77
Third Party | Gathering and Processing [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Total segment revenues and other income                 $ 3,087 $ 2,246 $ 1,684
[1] Includes an impairment expense of $89 million related to one of MPLX’s equity method investments for the year ended December 31, 2016.
[2] “Income/(loss) from equity method investments” includes the impact of any basis differential amortization or accretion.
[3] 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.
[4] Within the total segment revenues and other income amounts presented above, third party revenues for the L&S segment were $313 million, $160 million and $77 million for 2018, 2017 and 2016, respectively. Third party revenues for the G&P segment were $3,087 million, $2,246 million and $1,684 million for 2018, 2017 and 2016, respectively.
[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.