FAIR VALUE OF FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Risk Management - Additional Information (Details) - CAD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Market Risk, Credit Risk And Liquidity Risk [Line Items] | |||
| After tax loss | $ 3 | $ 5 | |
| Reclassified within next twelve months (less than) | $ 3 | ||
| Agreement term (in years) | 1 year | ||
| Allowance for doubtful accounts | $ 57 | $ 61 | $ 57 |
| Minimum | |||
| Market Risk, Credit Risk And Liquidity Risk [Line Items] | |||
| Account receivable, period (in days) | 60 days | 60 days | |
| Aged More Than 60 Days | |||
| Market Risk, Credit Risk And Liquidity Risk [Line Items] | |||
| Account receivable, percentage | 7.00% | 7.00% | |