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Earnings (Loss) Per Share (Tables)
 6 Months Ended
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
 2020201920202019
BasicDilutedBasicDilutedBasicDilutedBasicDiluted
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