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Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts Outstanding) (Details) - 12 months ended Dec. 31, 2022
CAD ($)
MWh
MMBTU
T
gal
USD ($)
Natural gas (MMBtu)    
Derivative [Line Items]    
Commodity, energy measure | MMBTU 2,099,176,239  
Electricity (MWh)    
Derivative [Line Items]    
Commodity, energy measure 33,018,171  
Oil (Gallons)    
Derivative [Line Items]    
Commodity, volume measure | gal 7,584,000  
Foreign currency exchange ($ CAD)    
Derivative [Line Items]    
Commodity, monetary measure | $ $ 164,965,288  
FTR (MWh)    
Derivative [Line Items]    
Commodity, energy measure 60,482  
Renewable Energy Certificates (MWh)    
Derivative [Line Items]    
Commodity, energy measure 7,340,257  
Carbon emissions (Metric Ton)    
Derivative [Line Items]    
Commodity, mass measure | T 140,639  
Interest rate contracts ($ USD)    
Derivative [Line Items]    
Commodity, monetary measure | $   $ 800,000,000