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Employee Benefit Plans (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
United States Pension Plans of U S Entity, Defined Benefit [Member]
Employee Benefit Plans (Textual) [Abstract]
Company contributions to plans	$ 11
Additional contributions expected to be made during remainder of 2016	325
Foreign Pension Plans, Defined Benefit [Member]
Employee Benefit Plans (Textual) [Abstract]
Company contributions to plans	22
Additional contributions expected to be made during remainder of 2016	$ 20

X

- Definition

Employee benefit plans.

+ References

No definition available.

+ Details

Name:	psx_EmployeeBenefitPlansTextualAbstract
Namespace Prefix:	psx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

+ Details

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Period Type:	duration

X

- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

+ References

No definition available.

+ Details

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- Details

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- Details

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