v3.26.3
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Schedule of Foreign Exchange Derivative Instruments that are Designated and Qualify as Fair Value Hedges (Details) - CAD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS        
Realized gain on derivative $ (35) $ 13 $ (28) $ 145
Foreign exchange contracts | Fair value hedges        
RISK MANAGEMENT AND FINANCIAL INSTRUMENTS        
Unrealized gain/(loss) on derivative (558) 1 (597) (13)
Unrealized gain/(loss) on hedged item 560 (1) 599 (2)
Realized gain on derivative 13 0 29 25
Realized loss on hedged item $ (13) $ 0 $ (29) $ (23)