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Condensed Consolidating Financial Information (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net of provision for income taxes on discontinued operations	$ 0	$ 0	$ 5,000,000
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Percentage of ownership In subsidiary	100.00%
Senior Notes \| Phillips 66
Condensed Financial Statements, Captions [Line Items]
Senior notes	$ 7,500,000,000.0

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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