ACQUISITIONS AND DISPOSITIONS - Schedule of Supplemental Pro Forma Consolidated Financial Information (Details) - CAD ($) $ in Millions	3 Months Ended	7 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Public Service Company of North Carolina, Incorporated
Business Acquisition [Line Items]
Operating revenues	$ 284		$ 54,116	$ 44,614
Earnings attributable to common shareholders	$ 50		5,149	5,944
Pro forma interest expense				48
Pro forma interest expense, net of tax				37
Questar Gas Company
Business Acquisition [Line Items]
Operating revenues		$ 755	54,698	45,918
Earnings attributable to common shareholders		$ 75	5,193	6,005
Pro forma interest expense				70
Pro forma interest expense, net of tax				53
The East Ohio Gas Company
Business Acquisition [Line Items]
Operating revenues			53,788	45,058
Earnings attributable to common shareholders			$ 5,130	5,961
Pro forma interest expense				100
Pro forma interest expense, net of tax				$ 77