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Investments, Loans and Long-Term Receivables (Liberty Pipeline LLC (Liberty)) (Details) - USD ($) $ in Millions | Mar. 02, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Variable Interest Entity, Primary Beneficiary | Phillips 66 Partners LP |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Equity investments |  | $ 3,340 | $ 2,961
Liberty Pipeline, LLC |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Maximum loss exposure |  | 251 |
Maximum potential amount of future payments under the guarantees |  | $ 49 |
Liberty Pipeline, LLC | Phillips 66 Partners LP |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Percentage of ownership interest | 50.00% |  |
Liberty Pipeline, LLC | Variable Interest Entity, Primary Beneficiary | Phillips 66 Partners LP |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Percentage of ownership interest |  | 50.00% |
Payments to acquire investments | $ 75 |  |
Equity investments |  | $ 202 |

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