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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, 2019
shares
NSRs [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Number of Share Options, Outstanding 32,214
Number of Share Units Exercisable 24,546
Number of Share Options, Granted 3,744
Number of units vested and exercised/paid out (59)
PSUs [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Number of Share Units, Outstanding 6,864
Number of Share Units, Granted 2,511
RSUs [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Number of Share Units, Outstanding 8,666
Number of Share Units, Granted 2,489
Number of Share Units, Vested and Exercised/Paid Out (1,108)
DSUs [Member]  
Disclosure of terms and conditions of share-based payment arrangement [Line Items]  
Number of Share Units, Outstanding 1,541
Number of Share Units Exercisable 1,541
Number of Share Units, Granted 241
Number of Share Units, Vested and Exercised/Paid Out (73)