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FAIR VALUE OF FINANCIAL INSTRUMENTS AND RISK MANAGEMENT - Summary of the Amounts Recorded in OCL and Reclassified to Financing Charges (Details) - Cash flow hedges, including current portion - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Amounts recorded in OCI/OCL    
Before tax loss $ 2 $ 1
After tax loss 1 1
Amounts reclassified to financing charges    
Before tax loss (gain) 4 (4)
After tax loss (gain) $ 3 $ (3)