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Earnings Per Share | 6 Months Ended
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Jun. 30, 2025
Earnings Per Share [Abstract] |
Earnings per Share | Earnings Per 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) | 2025 |  | 2024 |  | 2025 |  | 2024
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 outstanding | 307 |  |  | 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 outstanding | 307 |  |  | 349 |  |  | 309 |  |  | 355 |
Effect of dilutive securities | — |  |  | 1 |  |  | 1 |  |  | 1 |
Weighted average common shares, including dilutive effect | 307 |  |  | 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.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/260/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-3 + Details
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