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Variable Interest Entities (VIEs) Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2016	Dec. 31, 2015	Aug. 31, 2009	Aug. 28, 2009
Merey Sweeny L.P.
Variable Interest Entities (VIEs) (Textual) [Abstract]
Additional equity method ownership interest acquired in Merey Sweeny Limited Partnership				50.00%	50.00%
Book value of VIE		$ 203,000,000
Merey Sweeny L.P. | Guarantees of Joint Venture Debt
Variable Interest Entities (VIEs) (Textual) [Abstract]
Maximum exposure of loss/potential amount of future payments		326,000,000
Merey Sweeny L.P. | MSLP 8.85% Senior Notes | Guarantees of Joint Venture Debt
Variable Interest Entities (VIEs) (Textual) [Abstract]
Debt guarantee to lender, percentage	100.00%
Stated interest rate of debt, percent	8.85%
Maximum exposure of loss/potential amount of future payments		123,000,000
DAPL And ETCOP
Variable Interest Entities (VIEs) (Textual) [Abstract]
Maximum exposure of loss/potential amount of future payments		1,057,000,000
Book value of VIE		$ 532,000,000
Percentage of ownership interest		25.00%
Loans and leases receivable, related parties		$ 250,000,000
Carrying amount of indemnifications		275,000,000
Phillips 66 Partners LP
Variable Interest Entities (VIEs) (Textual) [Abstract]
Long-term debt		$ 2,396,000,000	$ 1,091,000,000

X

- Definition

Additional equity method ownership interest acquired in Merey Sweeny Limited Partnership.

+ References

No definition available.

+ Details

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- Definition

Guarantee obligations maximum exposure percentage.

+ References

No definition available.

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- Definition

Variable interest entities vies.

+ References

No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

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- Definition

For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(e))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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- Definition

Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph a
-URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5728-111685

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