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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
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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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