v3.26.3
Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2026
Earnings Per Share [Abstract]  
Summary of Earnings (Loss) Per Common Share
We compute basic earnings per share by dividing net income 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 per share using the two-class method. Diluted income per share assumes exercise of certain share-based compensation awards, provided the effect is not anti-dilutive.
Three Months Ended 
September 30,		Nine Months Ended 
September 30,
(In millions, except per share data)2026202520262025
Basic earnings per share:
Allocation of earnings
Net income attributable to MPC$7,447 $1,370 $13,096 $2,512 
Income allocated to participating securities(7)(2)(12)(3)
Income available to common stockholders - basic$7,440 $1,368 $13,084 $2,509 
Weighted average common shares outstanding279 303 287 307 
Basic earnings per share$26.66 $4.51 $45.51 $8.16 
Diluted earnings per share:
Allocation of earnings
Net income attributable to MPC$7,447 $1,370 $13,096 $2,512 
Income allocated to participating securities(7)(2)(12)(3)
Income available to common stockholders - diluted$7,440 $1,368 $13,084 $2,509 
Weighted average common shares outstanding279 303 287 307 
Effect of dilutive securities1 1 1 1 
Weighted average common shares, including dilutive effect280 304 288 308 
Diluted earnings per share$26.59 $4.51 $45.40 $8.15 
Potential common shares that were anti-dilutive and, therefore, omitted from the diluted share calculation, were immaterial for all periods.