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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, |  |
(In millions, except per share data) | 2026 |  | 2025 |  |  |  |
Basic earnings per share: |  |  |  |  |  |  |
Allocation of earnings |  |  |  |  |  |  |
Net income (loss) attributable to MPC | $ | 511 |  |  | $ | (74) |  |  |  |  |
Income allocated to participating securities | — |  |  | — |  |  |  |  |
Income (loss) available to common stockholders - basic | $ | 511 |  |  | $ | (74) |  |  |  |  |
Weighted average common shares outstanding | 295 |  |  | 313 |  |  |  |  |
Basic earnings (loss) per share | $ | 1.73 |  |  | $ | (0.24) |  |  |  |  |
Diluted earnings per share: |  |  |  |  |  |  |
Allocation of earnings |  |  |  |  |  |  |
Net income (loss) attributable to MPC | $ | 511 |  |  | $ | (74) |  |  |  |  |
Income allocated to participating securities | — |  |  | — |  |  |  |  |
Income (loss) available to common stockholders - diluted | $ | 511 |  |  | $ | (74) |  |  |  |  |
Weighted average common shares outstanding | 295 |  |  | 313 |  |  |  |  |
Effect of dilutive securities | — |  |  | — |  |  |  |  |
Weighted average common shares, including dilutive effect | 295 |  |  | 313 |  |  |  |  |
Diluted earnings (loss) per share | $ | 1.73 |  |  | $ | (0.24) |  |  |  |  |
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 Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482662/260-10-50-1 + Details
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