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Phillips 66 Partners LP (Narrative) (Details) - USD ($) shares in Millions		3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2018
Subsidiary or Equity Method Investee [Line Items]
Net gain on dispositions		$ 85,000,000	$ 0	$ 86,000,000	$ 1,000,000
Other				(15,000,000)	301,000,000
Gray Oak Pipeline LLC | Third Party
Subsidiary or Equity Method Investee [Line Items]
Other				$ 61,000,000
Gray Oak Pipeline LLC | Variable Interest Entity, Primary Beneficiary | Phillips 66 Partners LP
Subsidiary or Equity Method Investee [Line Items]
Effective ownership percent	42.25%	42.25%		42.25%
Phillips 66 Partners LP
Subsidiary or Equity Method Investee [Line Items]
Limited partner interest in Phillips 66 Partners owned by public, percentage	26.00%
Phillips 66 Partners LP | Variable Interest Entity, Primary Beneficiary
Subsidiary or Equity Method Investee [Line Items]
Limited partnership interest in Phillips 66 Partners, percentage	74.00%
Gray Oak Holdings LLC | Third Party
Subsidiary or Equity Method Investee [Line Items]
Net gain on dispositions		$ 84,000,000		$ 84,000,000
Gray Oak Holdings LLC | Third Party
Subsidiary or Equity Method Investee [Line Items]
Percentage of ownership	35.00%	35.00%		35.00%		35.00%
Gray Oak Holdings LLC | Gray Oak Pipeline LLC | Variable Interest Entity, Primary Beneficiary | Phillips 66 Partners LP
Subsidiary or Equity Method Investee [Line Items]
Percentage of ownership	65.00%	65.00%		65.00%
Common Units | At The Market Offering Program | Phillips 66 Partners LP
Subsidiary or Equity Method Investee [Line Items]
Partners' capital account, public sale of units net of offering costs		$ 0	$ 10,000,000	$ 2,000,000	$ 42,000,000
Common Units | Phillips 66 Partners LP | Variable Interest Entity, Primary Beneficiary
Subsidiary or Equity Method Investee [Line Items]
Ownership interest (in shares)	170.0	170.0		170.0
Preferred Units | Phillips 66 Partners LP
Subsidiary or Equity Method Investee [Line Items]
Ownership interest (in shares)	13.8	13.8		13.8

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