REVENUE - Schedule of Major Products and Services (Parenthetical) (Details) - CAD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Realized gain/(loss) on derivative	$ 33	$ (17)	$ 132	$ (39)
Revenues from lease contracts	141	142	299	282
Total revenue from contracts with customers	$ 6,523	5,927	$ 15,332	12,705
Gas Distribution Service | Revision of Prior Period, Reclassification, Adjustment
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers		$ 427		$ 685