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Loss per Share (Tables)
3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Summary of Earnings Per Common Share
We compute basic earnings (loss) per share by dividing net income (loss) attributable to MPC less income allocated to participating securities by the weighted average number of shares of common stock outstanding. Since MPC grants certain incentive compensation awards to employees and non-employee directors that are considered to be participating securities, we have calculated our earnings (loss) per share using the two-class method. Diluted income (loss) per share assumes exercise of certain stock-based compensation awards, provided the effect is not anti-dilutive.
 
Three Months Ended 
March 31,
(In millions, except per share data)
2020
 
2019
Basic loss per share:
 
 
 
Allocation of loss:
 
 
 
Net loss attributable to MPC
$
(9,234
)
 
$
(7
)
Income allocated to participating securities

 

Loss available to common stockholders – basic
$
(9,234
)
 
$
(7
)
Weighted average common shares outstanding
648

 
673

Basic loss per share
$
(14.25
)
 
$
(0.01
)
Diluted loss per share:
 
 
 
Allocation of loss:
 
 
 
Net loss attributable to MPC
$
(9,234
)
 
$
(7
)
Income allocated to participating securities

 

Loss available to common stockholders – diluted
$
(9,234
)
 
$
(7
)
Weighted average common shares outstanding
648

 
673

Effect of dilutive securities

 

Weighted average common shares, including dilutive effect
648

 
673

Diluted loss per share
$
(14.25
)
 
$
(0.01
)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following table summarizes the shares that were anti-dilutive and, therefore, were excluded from the diluted share calculation.
 
Three Months Ended 
March 31,
(In millions)
2020
 
2019
Shares issuable under stock-based compensation plans
10

 
7