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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2025
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 
June 30,		Six Months Ended 
June 30,
(In millions, except per share data)2025202420252024
Basic earnings per share:
Allocation of earnings
Net income attributable to MPC$1,216 $1,515 $1,142 $2,452 
Income allocated to participating securities(1)(1)(1)(2)
Income available to common stockholders - basic$1,215 $1,514 $1,141 $2,450 
Weighted average common shares outstanding307 349 309 355 
Basic earnings per share$3.96 $4.34 $3.69 $6.90 
Diluted earnings per share:
Allocation of earnings
Net income attributable to MPC$1,216 $1,515 $1,142 $2,452 
Income allocated to participating securities(1)(1)(1)(2)
Income available to common stockholders - diluted$1,215 $1,514 $1,141 $2,450 
Weighted average common shares outstanding307 349 309 355 
Effect of dilutive securities— 1 1 1 
Weighted average common shares, including dilutive effect307 350 310 356 
Diluted earnings per share$3.96 $4.33 $3.68 $6.88 
Potential common shares that were anti-dilutive and, therefore, omitted from the diluted share calculation, were immaterial for all periods.