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Earnings per Share (Tables) | 9 Months Ended
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Sep. 30, 2019
Earnings Per Share [Abstract] |
Summary of Earnings 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 stock-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) | 2019 |  | 2018 |  | 2019 |  | 2018
Basic earnings per share: |  |  |  |  |  |  |
Allocation of earnings: |  |  |  |  |  |  |
Net income attributable to MPC | $ | 1,095 |  |  | $ | 737 |  |  | $ | 2,194 |  |  | $ | 1,829 |
Income allocated to participating securities | — |  |  | — |  |  | 1 |  |  | 1 |
Income available to common stockholders – basic | $ | 1,095 |  |  | $ | 737 |  |  | $ | 2,193 |  |  | $ | 1,828 |
Weighted average common shares outstanding | 656 |  |  | 451 |  |  | 663 |  |  | 462 |
Basic earnings per share | $ | 1.67 |  |  | $ | 1.63 |  |  | $ | 3.31 |  |  | $ | 3.96 |
Diluted earnings per share: |  |  |  |  |  |  |
Allocation of earnings: |  |  |  |  |  |  |
Net income attributable to MPC | $ | 1,095 |  |  | $ | 737 |  |  | $ | 2,194 |  |  | $ | 1,829 |
Income allocated to participating securities | — |  |  | — |  |  | 1 |  |  | 1 |
Income available to common stockholders – diluted | $ | 1,095 |  |  | $ | 737 |  |  | $ | 2,193 |  |  | $ | 1,828 |
Weighted average common shares outstanding | 656 |  |  | 451 |  |  | 663 |  |  | 462 |
Effect of dilutive securities | 4 |  |  | 5 |  |  | 5 |  |  | 4 |
Weighted average common shares, including dilutive effect | 660 |  |  | 456 |  |  | 668 |  |  | 466 |
Diluted earnings per share | $ | 1.66 |  |  | $ | 1.62 |  |  | $ | 3.28 |  |  | $ | 3.92 |
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 September 30, |  | Nine Months Ended September 30,
(In millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Shares issuable under stock-based compensation plans | 4 |  |  | — |  |  | 3 |  |  | — |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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