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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