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Segment Disclosures and Related Information - Net Income (Loss) Attributable to ConocoPhillips, Investments In and Advances To Affiliates and Total Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Consolidated net income (loss) $ 10,957 $ 18,680 $ 8,079
Consolidated total assets 95,924 93,829 90,661
Related Party      
Segment Reporting Information [Line Items]      
Investments in and Advances to Affiliates 7,905 7,493 6,701
Corporate and Other      
Segment Reporting Information [Line Items]      
Consolidated net income (loss) (821) (330) (210)
Consolidated total assets 9,759 11,008 7,745
Corporate and Other | Related Party      
Segment Reporting Information [Line Items]      
Investments in and Advances to Affiliates 1,145 0 0
Alaska | Operating Segments      
Segment Reporting Information [Line Items]      
Consolidated net income (loss) 1,778 2,352 1,386
Consolidated total assets 16,174 15,126 14,812
Alaska | Operating Segments | Related Party      
Segment Reporting Information [Line Items]      
Investments in and Advances to Affiliates 32 55 58
Lower 48 | Operating Segments      
Segment Reporting Information [Line Items]      
Consolidated net income (loss) 6,461 11,015 4,932
Consolidated total assets 42,415 42,950 41,699
Lower 48 | Operating Segments | Related Party      
Segment Reporting Information [Line Items]      
Investments in and Advances to Affiliates 118 235 242
Canada | Operating Segments      
Segment Reporting Information [Line Items]      
Consolidated net income (loss) 402 714 458
Consolidated total assets 10,277 6,971 7,439
Canada | Operating Segments | Related Party      
Segment Reporting Information [Line Items]      
Investments in and Advances to Affiliates 0 0 0
Europe, Middle East and North Africa | Operating Segments      
Segment Reporting Information [Line Items]      
Consolidated net income (loss) 1,189 2,244 1,167
Consolidated total assets 8,396 8,263 9,125
Europe, Middle East and North Africa | Operating Segments | Related Party      
Segment Reporting Information [Line Items]      
Investments in and Advances to Affiliates 1,191 1,049 797
Asia Pacific | Operating Segments      
Segment Reporting Information [Line Items]      
Consolidated net income (loss) 1,961 2,736 453
Consolidated total assets 8,903 9,511 9,840
Asia Pacific | Operating Segments | Related Party      
Segment Reporting Information [Line Items]      
Investments in and Advances to Affiliates 5,419 6,154 5,603
Other International | Operating Segments      
Segment Reporting Information [Line Items]      
Consolidated net income (loss) (13) (51) (107)
Consolidated total assets 0 0 1
Other International | Operating Segments | Related Party      
Segment Reporting Information [Line Items]      
Investments in and Advances to Affiliates $ 0 $ 0 $ 1