Earnings (Loss) Per Share (Tables)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Reconciliation of Basic and Diluted Earnings Per Share

	Three Months Ended March 31
	2020					2019
	Basic			Diluted		Basic		Diluted
Amounts Attributed to Phillips 66 Common Stockholders (millions):
Net income (loss) attributable to Phillips 66	$	(2,496	)	(2,496	)	204		204
Income allocated to participating securities	(1		)	(1	)	(1	)	(1	)
Net income (loss) available to common stockholders	$	(2,497	)	(2,497	)	203		203
Weighted-average common shares outstanding (thousands):	439,014			441,345		454,886		457,599
Effect of share-based compensation	2,331			—		2,713		1,690
Weighted-average common shares outstanding—EPS	441,345			441,345		457,599		459,289
Earnings (Loss) Per Share of Common Stock (dollars)	$	(5.66	)	(5.66	)	0.44		0.44