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Property, Plant and Equipment (Regulated and Non-Regulated Assets) (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment, Net    
Total cost $ 32,273 $ 30,576
Less: Accumulated depreciation (9,994) (9,574)
Total cost less: Accumulated depreciation 22,279 21,002
Construction work in progress 2,097 1,994
Property, Plant and Equipment, Net 24,376 22,996
Generation    
Property, Plant and Equipment, Net    
Total cost $ 13,500 13,083
Generation | Range, Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 3 years  
Generation | Range, Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 131 years  
Transmission    
Property, Plant and Equipment, Net    
Total cost $ 2,835 2,731
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 $ 7,417 6,978
Distribution | Range, Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 4 years  
Distribution | Range, Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 80 years  
Gas transmission and distribution    
Property, Plant and Equipment, Net    
Total cost $ 5,536 5,061
Gas transmission and distribution | Range, Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 6 years  
Gas transmission and distribution | Range, Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 92 years  
General plant and other    
Property, Plant and Equipment, Net    
Total cost $ 2,985 $ 2,723
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 71 years