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Investments, Loans and Long-Term Receivables (Dakota Access, LLC and Energy Transfer Crude Oil, Company, LLC) (Details) - USD ($)	Jul. 06, 2020	Jun. 30, 2020	Jun. 10, 2020	Apr. 09, 2020	Mar. 11, 2019
Dakota Access and ETCO | Subsequent Event
Schedule of Equity Method Investments [Line Items]
Estimated period of time to prepare Environmental Impact Statement	13 months
Scheduled interest payments annually	$ 25,000,000
Variable Interest Entity, Primary Beneficiary | Phillips 66 Partners LP | Dakota Access and ETCO
Schedule of Equity Method Investments [Line Items]
Maximum exposure, undiscounted		$ 631,000,000
Senior Notes
Schedule of Equity Method Investments [Line Items]
Debt issued and guaranteed			$ 1,000,000,000	$ 1,000,000,000
Senior Notes | Dakota Access, LLC
Schedule of Equity Method Investments [Line Items]
Debt issued and guaranteed					$ 2,500,000,000
Senior Notes | 3.625% Senior Notes Due March 31 2022 | Dakota Access, LLC
Schedule of Equity Method Investments [Line Items]
Debt issued and guaranteed					$ 650,000,000
Debt interest rate					3.625%
Senior Notes | 3.900% Senior Notes Due March 31 2024 | Dakota Access, LLC
Schedule of Equity Method Investments [Line Items]
Debt issued and guaranteed					$ 1,000,000,000.0
Debt interest rate					3.90%
Senior Notes | 4.625% Senior Notes Due March 31 2029 | Dakota Access, LLC
Schedule of Equity Method Investments [Line Items]
Debt issued and guaranteed					$ 850,000,000
Debt interest rate					4.625%

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