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Earnings Per Share
 3 Months Ended
Mar. 31, 2025
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The numerator of basic earnings per share (EPS) is net income attributable to Phillips 66, adjusted for noncancelable dividends paid on unvested share-based employee awards during the vesting period (participating securities). The denominator of basic EPS is the sum of the daily weighted-average number of common shares outstanding during the periods presented and fully vested stock and unit awards that have not yet been issued as common stock. The numerator of diluted EPS is also based on net income attributable to Phillips 66, which is reduced by dividend equivalents paid on participating securities for which the dividends are more dilutive than the participation of the awards in the earnings of the periods presented. To the extent unvested stock, unit or option awards and vested unexercised stock options are dilutive, they are included with the weighted-average common shares outstanding in the denominator. Treasury stock is excluded from the denominator in both basic and diluted EPS.

 Three Months Ended March 31
 20252024
BasicDilutedBasicDiluted
Amounts Attributed to Phillips 66 Common Stockholders (millions):
Net Income Attributable to Phillips 66487 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 compensation1,256 1,323 1,794 2,947 
Weighted-average common shares outstanding—EPS409,182 410,505 428,959 431,906 
Earnings Per Share of Common Stock (dollars)
$1.19 1.18 1.74 1.73