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Equity-Based Compensation Plan (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 2020:
 
Number
of Units
 
Weighted
Average
Fair Value
Outstanding at December 31, 2019
1,109,568

 
$
35.97

Granted
168,212

 
20.49

Settled
(174,888
)
 
36.29

Forfeited
(335
)
 
33.55

Outstanding at March 31, 2020
1,102,557

 
$
33.56
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 three months ended March 31, 2020:
 
Number of
Units
Outstanding at December 31, 2019
2,157,347

Granted
2,147,211

Settled
(1,169,354
)
Forfeited
(18,750
)
Outstanding at March 31, 2020
3,116,454