OTHER INCOME/(EXPENSE) (Details) - CAD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Other Income and Expenses [Abstract]
Realized foreign currency gain/(loss)	$ (182)	$ 122
Unrealized foreign currency gain/(loss)	55	(858)
Net defined pension and OPEB credit	72	41
Other	175	144
Total	$ 120	$ (551)