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Earnings (Loss) Per Share (Tables) | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share [Abstract] |
Schedule of Reconciliation of Basic and Diluted Earnings Per Share |
| Three Months Ended June 30 |  |  |  |  | Six Months Ended June 30 |  |  |
| 2020 |  | 2019 |  |  | 2020 |  | 2019 |
| Basic | Diluted | Basic | Diluted |  | Basic | Diluted | Basic | Diluted
Amounts Attributed to Phillips 66 Common Stockholders (millions): |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Phillips 66 | $ | (141) |  | (141) |  | 1,424 |  | 1,424 |  |  | (2,637) |  | (2,637) |  | 1,628 |  | 1,628 |
Income allocated to participating securities | (2) |  | (2) |  | (2) |  | (1) |  |  | (4) |  | (4) |  | (3) |  | (2) |
Net income (loss) available to common stockholders | $ | (143) |  | (143) |  | 1,422 |  | 1,423 |  |  | (2,641) |  | (2,641) |  | 1,625 |  | 1,626 |
Weighted-average common shares outstanding (thousands): | 436,688 |  | 438,756 |  | 451,216 |  | 453,681 |  |  | 437,851 |  | 440,050 |  | 453,041 |  | 455,630 |
Effect of share-based compensation | 2,068 |  | — |  | 2,465 |  | 1,904 |  |  | 2,199 |  | — |  | 2,589 |  | 1,990 |
Weighted-average common shares outstanding—EPS | 438,756 |  | 438,756 |  | 453,681 |  | 455,585 |  |  | 440,050 |  | 440,050 |  | 455,630 |  | 457,620 |
Earnings (Loss) Per Share of Common Stock (dollars) | $ | (0.33) |  | (0.33) |  | 3.13 |  | 3.12 |  |  | (6.00) |  | (6.00) |  | 3.57 |  | 3.55 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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