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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
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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