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Property, Plant and Equipment - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
kV
kPa
Dec. 31, 2023
CAD ($)
Property, Plant and Equipment [Abstract]    
Electric distribution capacity, below (kV) | kV 69  
Gas distribution capacity, below (kPa) | kPa 2,070  
Electric transmission capacity, above (kV) | kV 69  
Gas transmission capacity, above (kPa) | kPa 2,070  
Cost of PPE under finance leases | $ $ 324 $ 318
Cost of PPE under finance leases, accumulated depreciation | $ $ 119 $ 113