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Net Income Per Limited Partner Unit (Tables)
 3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Distributions By Partner By Class
For the three months ended March 31, 2020 and 2019, MPLX had dilutive potential common units consisting of certain equity-based compensation awards. Potential common units omitted from the diluted earnings per unit calculation for the three months ended March 31, 2020 and 2019 were 1 million and less than 1 million, respectively.
 
Three Months Ended March 31,
(In millions)
2020
 
2019
Net income attributable to MPLX LP
$
(2,724
)
 
$
503

Less: Distributions declared on Series A preferred units(1)
20

 
20

Distributions declared on Series B preferred units(1)
11

 
—

Limited partners’ distributions declared on MPLX common units (including common units of general partner)(1)
728

 
523

Undistributed net loss attributable to MPLX LP
$
(3,483
)

$
(40
)

(1)
See Note 7 for distribution information.
Schedule of Basic and Diluted Earnings Per Unit
 
Three Months Ended March 31, 2020
(In millions, except per unit data)
Limited Partners’
Common Units
 
Series A Preferred Units
 
Series B Preferred Units
 
Total
Basic and diluted net income attributable to MPLX LP per unit
 
 
 
 
 
 
 
Net income attributable to MPLX LP:
 
 
 
 
 
 
 
Distributions declared
$
728

 
$
20

 
$
11

 
$
759

Undistributed net loss attributable to MPLX LP
(3,483
)
 
—

 
—

 
(3,483
)
Net income attributable to MPLX LP(1)
$
(2,755
)
 
$
20

 
$
11

 
$
(2,724
)
Weighted average units outstanding:
 
 
 
 
 
 
 
Basic
1,058

 
 
 
 
 

Diluted
1,058

 
 
 
 
 

Net income attributable to MPLX LP per limited partner unit:
 
 
 
 
 
 
 
Basic
$
(2.60
)
 
 
 
 
 
 
Diluted
$
(2.60
)
 
 
 
 
 
 

(1)
Allocation of net income attributable to MPLX LP assumes all earnings for the period had been distributed based on the distribution priorities applicable to the period.
 
Three Months Ended March 31, 2019
(In millions, except per unit data)
Limited Partners’
Common Units
 
Series A Preferred Units
 
Total
Basic and diluted net income attributable to MPLX LP per unit
 
 
 
 
 
Net income attributable to MPLX LP:
 
 
 
 
 
Distributions declared
$
523

 
$
20

 
$
543

Undistributed net loss attributable to MPLX LP
(40
)
 
—

 
(40
)
Net income attributable to MPLX LP(1)
$
483

 
$
20

 
$
503

Weighted average units outstanding:
 
 
 
 
 
Basic
794

 
 
 

Diluted
795

 
 
 

Net income attributable to MPLX LP per limited partner unit:
 
 
 
 
 
Basic
$
0.61

 


 
 
Diluted
$
0.61

 


 
 
(1)
Allocation of net income attributable to MPLX LP assumes all earnings for the period had been distributed based on the distribution priorities applicable to the period.