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Cover
 12 Months Ended
Dec. 31, 2021
shares
Document Information [Line Items]  
Document Type 40-F
Entity Registrant Name CENOVUS ENERGY INC.
Entity Central Index Key 0001475260
Current Fiscal Year End Date --12-31
Document Period End Date Dec. 31, 2021
Document Fiscal Year Focus 2021
Document Fiscal Period Focus FY
Amendment Flag false
Entity File Number 1-34513
Document Annual Report true
Entity Address, Address Line One 4100, 225 - 6 Avenue S.W.
Entity Address, Postal Zip Code T2P 1N2
Entity Address, City or Town Calgary
Entity Address, State or Province AB
Document Registration Statement false
Entity Address, Country CA
City Area Code 403
Local Phone Number 766-2000
Trading Symbol CVE
Title of 12(b) Security Common shares, no par value (together with associated common share purchase rights)
Security Exchange Name NYSE
Entity Common Stock, Shares Outstanding 2,001,210,953
Audited Annual Financial Statements true
Annual Information Form true
Entity Current Reporting Status Yes
Entity Emerging Growth Company false
Entity Interactive Data Current Yes
Entity Incorporation, State or Country Code Z4
ICFR Auditor Attestation Flag true
Warrants  
Document Information [Line Items]  
Trading Symbol CVE WS
Title of 12(b) Security Warrants (each warrant entitles the holder to purchase one common share at an exercise price of C$6.54 per share)
Security Exchange Name NYSE
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line One 28 Liberty Street
Entity Address, Postal Zip Code 10005
Entity Address, City or Town New York
Entity Address, State or Province NY
City Area Code 212
Local Phone Number 894-8940
Contact Personnel Name CT Corporation System