v3.19.3.a.u2
Document and Entity Information - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 28, 2019
Document And Entity Information [Abstract]      
Entity Central Index Key 0001163165    
Amendment Flag false    
Entity File Number 001-32395    
Entity Registrant Name ConocoPhillips    
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31    
Entity Incorporation State or Country Code DE    
Entity Tax Identification Number 01-0562944    
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    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 67.7
Entity Common Stock, Shares Outstanding   1,081,132,415  
Entity Listings [Line Items]      
Documents Incorporated By Reference [Text Block]
Documents incorporated by reference:
Portions of the Proxy Statement for the Annual Meeting of Stockholders to be
 
held on May 12, 2020 (Part III)
   
Common Stock, $.01 Par Value [Member]      
Entity Listings [Line Items]      
Title of 12(b) Security Common Stock, $.01 Par Value    
Trading Symbol COP    
Security Exchange Name NYSE    
Seven Percent Debentures Due Twenty Twenty-nine [Member]      
Entity Listings [Line Items]      
Title of 12(b) Security 7% Debentures due 2029    
Trading Symbol CUSIP—718507BK1    
Security Exchange Name NYSE