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Earnings per Share (Summary of Earnings Per Share Calculation) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Basic EPS Calculation
Net income attributable to Phillips 66	$ 496	$ 1,012	$ 881	$ 1,999
Income allocated to participating securities	(2)	(2)	(3)	(3)
Net Income available to common stockholders	$ 494	$ 1,010	$ 878	$ 1,996
Weighted-average common shares outstanding (thousands)	524,080	539,848	525,654	541,649
Effect of stock-based compensation (thousands)	4,167	4,769	4,339	4,749
Weighted-average commons shares outstanding - EPS (thousands)	528,247	544,617	529,993	546,398
Diluted EPS Calculation
Income allocated to participating securities	$ (1)		$ (3)
Net Income available to common stockholders	$ 495	$ 1,012	$ 878	$ 1,999
Effect of stock-based compensation (thousands)	2,813	4,309	2,822	4,587
Weighted-average commons shares outstanding - EPS (thousands)	531,060	548,926	532,815	550,985
Earnings Per Share of Common Stock (dollars), Basic (in usd per share)	$ 0.94	$ 1.85	$ 1.66	$ 3.65
Earnings Per Share of Common Stock (dollars), Diluted (in usd per share)	$ 0.93	$ 1.84	$ 1.65	$ 3.63

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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