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Segment Disclosures and Related Information (Summary of Equity in Earnings of Affiliates, Income Taxes, and Net Income) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Analysis of results of equity in earnings of affiliates by operating segment
Equity in earnings of affiliates									$ 1,414	$ 1,573	$ 2,466
Provision for income taxes									547	1,764	1,654
Net Income Attributable to Phillips 66	$ 163	$ 511	$ 496	$ 385	$ 650	$ 1,578	$ 1,012	$ 987	1,555	4,227	4,762
Midstream
Analysis of results of equity in earnings of affiliates by operating segment
Equity in earnings of affiliates									184	(268)	360
Provision for income taxes									123	73	310
Net Income Attributable to Phillips 66									178	13	507
Chemicals
Analysis of results of equity in earnings of affiliates by operating segment
Equity in earnings of affiliates									834	1,316	1,634
Provision for income taxes									256	353	495
Net Income Attributable to Phillips 66									583	962	1,137
Refining
Analysis of results of equity in earnings of affiliates by operating segment
Equity in earnings of affiliates									164	325	311
Provision for income taxes									61	1,104	696
Net Income Attributable to Phillips 66									374	2,555	1,771
Marketing and Specialties
Analysis of results of equity in earnings of affiliates by operating segment
Equity in earnings of affiliates									232	207	162
Provision for income taxes									370	466	440
Net Income Attributable to Phillips 66									891	1,187	1,034
Corporate and Other
Analysis of results of equity in earnings of affiliates by operating segment
Equity in earnings of affiliates									0	(7)	(1)
Provision for income taxes									(263)	(232)	(287)
Net Income Attributable to Phillips 66									$ (471)	(490)	(393)
Discontinued Operations
Analysis of results of equity in earnings of affiliates by operating segment
Net Income Attributable to Phillips 66										$ 0	$ 706

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+ References

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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