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Condensed Consolidating Financial Information (Narrative) (Details)	Jun. 30, 2016 USD ($)
Phillips 66 [Member] | Senior Notes [Member]
Condensed Financial Statements, Captions [Line Items]
Debt issued and guaranteed	$ 7,500,000,000.0
Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Percentage of ownership in subsidiary guarantor	100.00%

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- Definition

Percentage of ownership in subsidiary

+ References

No definition available.

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- Definition

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+ References

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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