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Equity - Net Income Allocation (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Equity [Abstract]    
Net income attributable to MPLX LP [1] $ 421 $ 150
Less: Preferred unit distributions 16 16
General partner's IDRs and other   61
Net income attributable to MPLX LP available to general and limited partners   73
General partner's two percent GP Interest in net income attributable to MPLX LP   1
Less: General partner’s GP interest in net income attributable to MPLX LP $ 0 $ 62
[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.