| Cover | Nov. 19, 2019 |
| Investment Company, Financial Highlights [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Nov. 19, 2019 |
| Entity File Number | 001-32395 |
| Entity Registrant Name | ConocoPhillips |
| Entity Central Index Key | 0001163165 |
| Entity Tax Identification Number | 01-0562944 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 925 N. Eldridge Parkway |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77079 |
| City Area Code | 281 |
| Local Phone Number | 293-1000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Treasury Stock, Common [Member] | |
| Investment Company, Financial Highlights [Line Items] | |
| Title of 12(b) Security | Common Stock, $.01 Par Value Per Share |
| Trading Symbol | COP |
| Security Exchange Name | NYSE |
| 7% Debentures due 2029 [Member] | |
| Investment Company, Financial Highlights [Line Items] | |
| Title of 12(b) Security | 7% Debentures due 2029 |
| Trading Symbol | CUSIP-718507BK1 |
| Security Exchange Name | NYSE |
