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Equity-Based Compensation Plan (Tables)
 6 Months Ended
Jun. 30, 2017
Phantom Units [Member]  
Equity Transactions And Share Based Compensation [Line Items]  
Summary of Share-based Compensation, Restricted Stock Units Award Activity
The following is a summary of phantom unit award activity of MPLX LP common units for the six months ended June 30, 2017:
 
Number
of Units
 
Weighted
Average
Fair Value
Outstanding at December 31, 2016
1,173,411

 
$
33.09

Granted
529,434

 
36.86

Settled
(268,154
)
 
33.47

Forfeited
(62,852
)
 
34.66

Outstanding at June 30, 2017
1,371,839

 
34.40
Performance Shares [Member]  
Equity Transactions And Share Based Compensation [Line Items]  
Summary of Share-based Compensation, Restricted Stock Units Award Activity
The following is a summary of the equity-classified performance unit award activity for the six months ended June 30, 2017:
 
Number of
Units
Outstanding at December 31, 2016
1,799,249

Granted
1,407,062

Settled
(464,500
)
Forfeited
(15,312
)
Outstanding at June 30, 2017
2,726,499