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DOCUMENT AND ENTITY INFORMATION
 12 Months Ended
Dec. 31, 2018
shares
Document And Entity Information [Abstract]  
Entity Registrant Name CANADIAN NATURAL RESOURCES LTD
Entity Central Index Key 0001017413
Current Fiscal Year End Date --12-31
Entity Current Reporting Status Yes
Document Type 40-F
Document Period End Date Dec. 31, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus FY
Amendment Flag false
Emerging Growth Company false
Entity Common Stock, Shares Outstanding (in shares) 1,201,885,667