REVENUE - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 CAD ($)
Revenue from Contract with Customer [Abstract]
Contract with customer, liability, revenue recognized	$ 372
Increase (decrease) in contract with customers, liability	532
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligations expected to be fulfilled in future periods	$ 62,600
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, period (in years)	1 year
Performance obligations expected to be fulfilled in future periods	$ 10,400
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, period (in years)	4 years
Performance obligations expected to be fulfilled in future periods	$ 25,200
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2030-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, period (in years)
Performance obligations expected to be fulfilled in future periods	$ 27,000