v3.19.3.a.u2
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