v3.26.3
FOREIGN EXCHANGE (GAIN) LOSS, NET (Details) - CAD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items]        
Unrealized Foreign Exchange (Gain) Loss $ (108) $ 153 $ 309 $ (248)
Realized Foreign Exchange (Gain) Loss 54 4 (21) 52
Total (54) 157 288 (196)
U.S. Dollar Debt        
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items]        
Unrealized Foreign Exchange (Gain) Loss (9) 99 207 (184)
Other        
Disclosure Of Effect Of Changes In Foreign Exchange Rates Gain Loss [Line Items]        
Unrealized Foreign Exchange (Gain) Loss $ (99) $ 54 $ 102 $ (64)