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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Public Utility, Property, Plant and Equipment [Line Items]    
Debt component of AFUDC $ 56 $ 45
Property, plant and equipment, weighted average composite depreciation rate 2.60% 2.70%
Property, plant and equipment, generation remaining service life 23 years 22 years
Property, plant and equipment, other weighted average remaining service life 10 years 11 years
Electric Distribution    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, distribution weighted average remaining service life 31 years 31 years
Gas Distribution    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, distribution weighted average remaining service life 38 years 39 years
Electric Transmission    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, transmission weighted average remaining service life 41 years 41 years
Gas Transmission    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, transmission weighted average remaining service life 36 years 35 years
Minimum    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, straight line depreciation rate 0.50% 0.50%
Property, plant and equipment, generation service life 2 years 5 years
Property, plant and equipment, other service life 3 years 3 years
Minimum | Electric Distribution    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, distribution service life 5 years 5 years
Minimum | Gas Distribution    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, distribution service life 18 years 18 years
Minimum | Electric Transmission    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, transmission service life 20 years 20 years
Minimum | Gas Transmission    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, transmission service life 10 years 10 years
Maximum    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, straight line depreciation rate 35.00% 39.80%
Property, plant and equipment, generation service life 95 years 95 years
Property, plant and equipment, other service life 80 years 80 years
Maximum | Electric Distribution    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, distribution service life 80 years 80 years
Maximum | Gas Distribution    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, distribution service life 95 years 95 years
Maximum | Electric Transmission    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, transmission service life 90 years 90 years
Maximum | Gas Transmission    
Public Utility, Property, Plant and Equipment [Line Items]    
Property, plant and equipment, transmission service life 85 years 85 years