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Investments, Loans and Long-Term Receivables (Gray Oak Pipeline, LLC) (Details) - USD ($) | Jun. 30, 2020 | Jan. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Phillips 66 Partners LP | Variable Interest Entity, Primary Beneficiary |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity investments | $ 3,340,000,000 |  | $ 2,961,000,000 |
Third Party | Gray Oak Holdings LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of ownership | 35.00% |  |  | 35.00%
Gray Oak Pipeline LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Maximum loan |  | $ 1,379,000,000 |  |
Gray Oak Pipeline LLC | Phillips 66 Partners LP | Variable Interest Entity, Primary Beneficiary |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Effective ownership percent | 42.25% |  |  |
Maximum potential amount of future payments under the guarantees | $ 583,000,000 |  |  |
Equity investments | $ 896,000,000 |  |  |
Gray Oak Pipeline LLC | Phillips 66 Partners LP | Variable Interest Entity, Primary Beneficiary | Gray Oak Holdings LLC |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Percentage of ownership | 65.00% |  |  |

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