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Equity-Based Compensation Plan (Tables)
 6 Months Ended
Jun. 30, 2020
Phantom Units  
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, 2020:
 
Number
of Units
 
Weighted
Average
Fair Value
Outstanding at December 31, 2019
1,109,568

 
$
35.97

Granted
195,461

 
19.43

Settled
(323,884
)
 
35.67

Forfeited
(4,627
)
 
36.40

Outstanding at June 30, 2020
976,518

 
$
32.76
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 activity for performance unit awards to be settled in MPLX LP common units for the six months ended June 30, 2020:
 
Number of
Units
Outstanding at December 31, 2019
2,157,347

Granted
2,147,211

Settled
(1,169,354
)
Forfeited
(31,668
)
Outstanding at June 30, 2020
3,103,536