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Document and Entity Information
 12 Months Ended
Dec. 31, 2020
shares
Document And Entity Information [Abstract]  
Document Type 40-F
Amendment Flag false
Document Period End Date Dec. 31, 2020
Document Fiscal Year Focus 2020
Document Fiscal Period Focus FY
Trading Symbol CVE
Entity Registrant Name CENOVUS ENERGY INC.
Entity Central Index Key 0001475260
Current Fiscal Year End Date --12-31
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Common Stock, Shares Outstanding 1,228,869,903
Entity Emerging Growth Company false
Entity Address, State or Province AB
Entity Address, Country CA