OTHER INCOME (Details) - CAD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Other Income and Expenses [Abstract]
Gain/(loss) on dispositions	$ 3	$ (2)
Realized foreign currency gain	145	2
Unrealized foreign currency gain/(loss)	(188)	367
Net defined pension and OPEB credit	33	58
Other	109	33
Total	$ 102	$ 458