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REVENUE - Schedule of Major Products and Services (Parenthetical) (Details) - CAD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Disaggregation of Revenue [Line Items]        
Realized gain/(loss) on derivative $ 13 $ 54 $ 145 $ 15
Revenues from lease contracts 116 125 415 407
Total revenue from contracts with customers $ 6,149 5,733 $ 21,481 18,438
Gas Distribution Service | Revision of Prior Period, Reclassification, Adjustment        
Disaggregation of Revenue [Line Items]        
Total revenue from contracts with customers   $ 389   $ 1,100