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Phillips 66 Partners LP (Schedule of Assets and Liabilities) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Cash and cash equivalents | $ 1,890 | $ 1,614
Phillips 66 Partners LP | Variable Interest Entity, Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Cash and cash equivalents | 7 | 286
Equity investments | 3,340 | 2,961
Net properties, plants and equipment | 3,500 | 3,349
Short-term debt | 265 | 25
Long-term debt | $ 3,442 | $ 3,491

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