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Earnings (Loss) Per Share (Summary of Earnings Per Share Calculation) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Basic |  |  |  |
Net income (loss) attributable to Phillips 66 | $ (141) | $ 1,424 | $ (2,637) | $ 1,628
Income allocated to participating securities | (2) | (2) | (4) | (3)
Net income (loss) available to common stockholders | $ (143) | $ 1,422 | $ (2,641) | $ 1,625
Weighted-average common shares outstanding (in shares) | 436,688 | 451,216 | 437,851 | 453,041
Effect of share-based compensation (in shares) | 2,068 | 2,465 | 2,199 | 2,589
Weighted-average commons shares outstanding - EPS (in shares) | 438,756 | 453,681 | 440,050 | 455,630
Earnings (Loss) Per Share of Common Stock (in usd per share) | $ (0.33) | $ 3.13 | $ (6.00) | $ 3.57
Diluted |  |  |  |
Net income (loss) attributable to Phillips 66 | $ (141) | $ 1,424 | $ (2,637) | $ 1,628
Income allocated to participating securities | (2) | (1) | (4) | (2)
Net income (loss) available to common stockholders | $ (143) | $ 1,423 | $ (2,641) | $ 1,626
Weighted-average common shares outstanding (in shares) | 438,756 | 453,681 | 440,050 | 455,630
Effect of share-based compensation (in shares) | 0 | 1,904 | 0 | 1,990
Weighted-average commons shares outstanding - EPS (in shares) | 438,756 | 455,585 | 440,050 | 457,620
Earnings (Loss) Per Share of Common Stock (in usd per share) | $ (0.33) | $ 3.12 | $ (6.00) | $ 3.55

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