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Financial Instruments - Reconciliation of Changes in the Fair Value of Cenovus's Risk Management Assets and Liabilities (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2023
CAD ($)
Disclosure of detailed information about financial instruments [abstract]  
As at December 31, 2022 $ 46
Change in Fair Value of Contracts in Place, Beginning of Year 1
Change in Fair Value of Contracts Entered Into During the Period (76)
Fair Value of Contracts Realized During the Period 1
Unrealized Foreign Exchange Gain (Loss) on U.S. Dollar Contracts 1
As at September 30, 2023 $ (27)