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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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