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Stock-Based Compensation Plans - Summary of Information Related to Cenovus's Stock-Based Compensation Plans (Detail)
shares in Thousands
6 Months Ended
Jun. 30, 2018
shares
NSRs [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Number of Share Options, Outstanding 36,864
Number of Share Units Exercisable 29,247
Number of Share Options, Granted 3,909
PSUs [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Number of Share Units, Outstanding 6,338
Number of Share Units, Granted 3,068
RSUs [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Number of Share Units, Outstanding 6,996
Number of Share Units, Granted 3,487
Number of Share Units, Vested and Paid Out 1,772
DSUs [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Number of Share Units, Outstanding 1,538
Number of Share Units Exercisable 1,538
Number of Share Units, Granted 198
Number of Share Units, Vested and Paid Out 114