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, 2026
CAD ($)
| |
| Disclosure of detailed information about financial instruments [abstract] | |
| As at December 31, 2025 | $ 10 |
| Change in Fair Value of Contracts in Place, Beginning of Year | 5 |
| Change in Fair Value of Contracts Entered Into During the Period | (85) |
| Fair Value of Contracts Realized During the Period | 98 |
| As at September 30, 2026 | $ 28 |