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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2025
Earnings Per Share [Abstract] |
Schedule of Reconciliation of Basic and Diluted Earnings Per Share |
| Three Months Ended March 31 |  |
| 2025 |  | 2024 |  |  |
| Basic | Diluted |  | Basic | Diluted |  |  |  |  |
Amounts Attributed to Phillips 66 Common Stockholders (millions): |  |  |  |  |  |  |  |  |  |
Net Income Attributable to Phillips 66 | 487 |  | 487 |  |  | 748 |  | 748 |  |  |  |  |  |
Income allocated to participating securities | (2) |  | (2) |  |  | (2) |  | (1) |  |  |  |  |  |
Net income available to common stockholders | $ | 485 |  | 485 |  |  | 746 |  | 747 |  |  |  |  |  |
Weighted-average common shares outstanding (thousands): | 407,926 |  | 409,182 |  |  | 427,165 |  | 428,959 |  |  |  |  |  |
Effect of share-based compensation | 1,256 |  | 1,323 |  |  | 1,794 |  | 2,947 |  |  |  |  |  |
Weighted-average common shares outstanding—EPS | 409,182 |  | 410,505 |  |  | 428,959 |  | 431,906 |  |  |  |  |  |
Earnings Per Share of Common Stock (dollars) | $ | 1.19 |  | 1.18 |  |  | 1.74 |  | 1.73 |  |  |  |  |  |

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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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