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Property, Plant and Equipment (Regulated and Non-Regulated Assets) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment, Net    
Total cost $ 33,651 $ 32,273
Less: Accumulated depreciation (10,442) (9,994)
Total cost less: Accumulated depreciation 23,209 22,279
Construction work in progress 2,959 2,097
Property, Plant and Equipment, Net 26,168 24,376
Generation    
Property, Plant and Equipment, Net    
Total cost $ 14,297 13,500
Generation | Range, Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 5 years  
Generation | Range, Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 131 years  
Transmission    
Property, Plant and Equipment, Net    
Total cost $ 3,106 2,835
Transmission | Range, Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 10 years  
Transmission | Range, Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 80 years  
Distribution    
Property, Plant and Equipment, Net    
Total cost $ 8,512 7,417
Distribution | Range, Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 10 years  
Distribution | Range, Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 65 years  
Gas transmission and distribution    
Property, Plant and Equipment, Net    
Total cost $ 4,658 5,536
Gas transmission and distribution | Range, Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 15 years  
Gas transmission and distribution | Range, Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 75 years  
General plant and other    
Property, Plant and Equipment, Net    
Total cost $ 3,078 $ 2,985
General plant and other | Range, Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 2 years  
General plant and other | Range, Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 60 years