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Earnings (Loss) Per Share (Tables)
6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Schedule of Reconciliation of Basic and Diluted Earnings Per Share
 Three Months Ended
June 30
Six Months Ended
June 30
 2021202020212020
BasicDilutedBasicDilutedBasicDilutedBasicDiluted
Amounts Attributed to Phillips 66 Common Stockholders (millions):
Net income (loss) attributable to Phillips 66$296 296 (141)(141)(358)(358)(2,637)(2,637)
Income allocated to participating securities(3)(3)(2)(2)(6)(6)(4)(4)
Premium paid for the repurchase of noncontrolling interests(2)(2)— — (2)(2)— — 
Net income (loss) available to common stockholders$291 291 (143)(143)(366)(366)(2,641)(2,641)
Weighted-average common shares outstanding (thousands):
437,909 439,940 436,688 438,756 437,639 439,722 437,851 440,050 
Effect of share-based compensation2,031 456 2,068 — 2,083  2,199 — 
Weighted-average common shares
    outstanding—EPS
439,940 440,396 438,756 438,756 439,722 439,722 440,050 440,050 
Earnings (Loss) Per Share of Common Stock (dollars)
$0.66 0.66 (0.33)(0.33)(0.83)(0.83)(6.00)(6.00)