REVENUE - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 CAD ($)
Revenue from Contract with Customer [Abstract]
Contract with customer, liability, revenue recognized	$ (246)
Increase (decrease) in contract with customers, liability	632
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be fulfilled in future periods	$ 59,100
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, period	1 year
Performance obligations expected to be fulfilled in future periods	$ 7,500