LEASES - Lessor Lease Income (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Operating lease income	$ 266	$ 263	$ 265
Variable lease income	$ 321	333	361
Operating Lease Income Comprehensive Income Extensible List Not Disclosed Flag	Total lease income1
Total lease income	$ 587	$ 596	$ 626