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Financial Instruments - Reconciliation of Changes in the Fair Value of Cenovus's Risk Management Assets and Liabilities (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments [abstract]    
Fair Value of Contracts, Beginning of Year $ (68) $ (53)
Acquisition (Note 5) 0 (14)
Change in Fair Value of Contracts in Place at Beginning of Year (5) 0
Change in Fair Value of Contracts Entered Into During the Year (1,641) (995)
Fair Value of Contracts Realized During the Year 1,762 993
Unrealized Foreign Exchange Gain (Loss) on U.S. Dollar Contracts (2) 1
Fair Value of Contracts, End of Year $ 46 $ (68)