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Stock-Based Compensation Plans - Narrative (Detail) share in Thousands | 9 Months Ended |
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Sep. 30, 2021 shares $ / shares | Sep. 30, 2021 $ / shares | Sep. 30, 2021 share $ / shares | Jan. 01, 2021 shares
Cenovus Replacement Stock Options |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Number of share options per replacement stock option (in shares) | shares |  |  |  | 0.7845
Weighted average exercise price (in CAD per share) | $ / shares | $ 15.10 | $ 15.10 | $ 15.10 |
Number of shares issued for stock options exercised (in shares) | 607,000 |  | 2,000 |
Weighted average exercise price of shares exercised (in CAD per share) | $ / shares |  | 3.55 |  |
Number of share options exercised and settled for shares (in shares) | shares | 3,000 |  |  |
Number of share options exercised and settled for cash (in shares) | shares | 604,000 |  |  |
Stock Options With Associated Net Settlement Rights |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |
Weighted average exercise price (in CAD per share) | $ / shares | $ 13.07 | 13.07 | $ 13.07 |
Number of shares issued for stock options exercised (in shares) | shares | 32,000 |  |  |
Weighted average exercise price of shares exercised (in CAD per share) | $ / shares |  | $ 9.48 |  |

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