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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Basic    
Net Income Attributable to Phillips 66 $ 487 $ 748
Income allocated to participating securities (2) (2)
Net income available to common stockholders $ 485 $ 746
Weighted-average common shares outstanding (in shares) 407,926 427,165
Effect of share-based compensation (in shares) 1,256 1,794
Weighted-average commons shares outstanding - EPS (in shares) 409,182 428,959
Earnings Per Share of Common Stock (in usd per share) $ 1.19 $ 1.74
Diluted    
Net Income Attributable to Phillips 66 $ 487 $ 748
Income allocated to participating securities (2) (1)
Net income available to common stockholders $ 485 $ 747
Weighted-average common shares outstanding (in shares) 409,182 428,959
Effect of share-based compensation (in shares) 1,323 2,947
Weighted-average commons shares outstanding - EPS (in shares) 410,505 431,906
Earnings Per Share of Common Stock (in usd per share) $ 1.18 $ 1.73