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Equity - Net Income Allocation (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stockholders Equity [Line Items]        
Net income (loss) attributable to MPLX LP [1] $ 190 $ 19 $ 340 $ (41)
Preferred unit distributions (311) (231) (590) (431)
General partner's incentive distribution rights and other 72 47 133 88
Net income (loss) attributable to MPLX LP available to general and limited partners 101 (37) 174 (138)
General partner's two percent GP Interest in net income (loss) attributable to MPLX LP 2 (1) 3 (3)
Less: General partner’s interest in net income attributable to MPLX LP 74 46 136 85
Preferred Units        
Stockholders Equity [Line Items]        
Net income (loss) attributable to MPLX LP [1] 17 9 33 9
Preferred unit distributions [2] $ (17) $ (9) $ (33) $ (9)
[1] Allocation of net income (loss) attributable to MPLX LP assumes all earnings for the period had been distributed based on the current period distribution priorities.
[2] See Note 7 for distribution information.