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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%