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Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts Outstanding) (Details) - 3 months ended Mar. 31, 2023
CAD ($)
MWh
MMBTU
T
gal
USD ($)
Natural gas (MMBtu)    
Derivative [Line Items]    
Commodity, energy measures | MMBTU 2,235,749,935  
Electricity (MWh)    
Derivative [Line Items]    
Commodity, energy measures 45,761,663  
Oil (Gallons)    
Derivative [Line Items]    
Commodity, volume measure | gal 6,636,000  
Foreign currency exchange ($ CAD)    
Derivative [Line Items]    
Commodity, monetary measure | $ $ 176,540,767  
FTR (MWh)    
Derivative [Line Items]    
Commodity, energy measures 22,538  
Renewable Energy Certificates (MWh)    
Derivative [Line Items]    
Commodity, energy measures 9,737,373  
Carbon emissions (Metric Tons)    
Derivative [Line Items]    
Commodity, mass measure | T 581,250  
Interest rate contracts ($ USD)    
Derivative [Line Items]    
Commodity, monetary measure | $   $ 1,250,000,000