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DOCUMENT AND ENTITY INFORMATION
 12 Months Ended
Dec. 31, 2017
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, 2017
Document Fiscal Year Focus 2017
Document Fiscal Period Focus FY
Amendment Flag false
Entity Common Stock, Shares Outstanding 1,222,769,000