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Supplementary Information - Condensed Consolidating Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Repayments of Debt |  |  | $ 4,970 | $ 6,594
Proceeds from Collection of Long-term Loans to Related Parties |  |  | $ 119 | $ 115
ConocoPhillips - [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Proceeds from Contributions from Affiliates | $ 2,500 |  |  |
ConocoPhillips - [Member] | ConocoPhillips Company [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
NonControlling Interest Ownership |  |  | 100.00% |
ConocoPhillips Company [Member] | Reportable Legal Entities [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Proceeds from Collection of Long-term Loans to Related Parties | $ 1,200 | $ 1,200 |  |
ConocoPhillips Company [Member] | ConocoPhillips Canada Funding Company I [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
NonControlling Interest Ownership |  |  | 100.00% |

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