Investments, Loans and Long-Term Receivables - Dakota Access, LLC and Energy Transfer Crude Oil, Company, LLC (Details) - USD ($) |
12 Months Ended | |||
---|---|---|---|---|
Dec. 31, 2021 |
Mar. 31, 2021 |
Dec. 31, 2020 |
Mar. 31, 2019 |
|
Dakota Access, LLC | Forecast | ||||
Schedule of Equity Method Investments [Line Items] | ||||
Scheduled interest payments annually | $ 25,000,000 | |||
Phillips 66 Partners LP | Variable Interest Entity, Primary Beneficiary | ||||
Schedule of Equity Method Investments [Line Items] | ||||
Equity investments | $ 3,029,000,000 | $ 3,244,000,000 | ||
Phillips 66 Partners LP | Variable Interest Entity, Primary Beneficiary | Dakota Access and ETCO | ||||
Schedule of Equity Method Investments [Line Items] | ||||
Maximum exposure, undiscounted | 631,000,000 | |||
Equity investments | $ 575,000,000 | |||
Senior Notes | Dakota Access, LLC | ||||
Schedule of Equity Method Investments [Line Items] | ||||
Debt issued and guaranteed | $ 2,500,000,000 |