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Supplementary Information - Condensed Consolidating Financial Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |
Repayment of Debt | $ 80.0 | $ 4,995.0 | $ 7,876.0
Proceeds from Collection of Long-term Loans to Related Parties | 127.0 | 119.0 | 115.0
ConocoPhillips [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Proceeds from Contributions from Affiliates | 2,400.0 | 3,500.0 | 7,800.0
Payments of Distributions to Affiliates | 1,700.0 | 1,000.0 | 200.0
ConocoPhillips Company [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Proceeds from Collection of Long-term Loans to Related Parties | 4,200.0 | 2,400.0 | 1.4
Proceeds from Contributions from Affiliates |  |  | $ 9.8
Payments of Distributions to Affiliates | 4,500.0 | $ 4,800.0 |
Burlington Resources LLC [Member] | ConocoPhillips [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Proceeds from Collection of Long-term Loans to Related Parties | $ 3,200.0 |  |

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