REGULATORY MATTERS -Southern Lights Pipeline (Narrative) (Details) - CAD ($) $ in Millions	1 Months Ended
	Feb. 29, 2024	Dec. 31, 2024	Dec. 31, 2023
Public Utilities, General Disclosures [Line Items]
Total regulatory asset		$ 7,619	$ 5,707
Regulatory liabilities		$ 6,728	3,828
Southern Lights Pipeline
Public Utilities, General Disclosures [Line Items]
Total regulatory asset			92
Regulatory agreement term	5 years
Regulatory liabilities			151
Deferred tax liabilities, regulatory assets			$ 23