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Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts Outstanding) (Details)
6 Months Ended
Jun. 30, 2022
CAD ($)
MWh
MMBTU
T
gal
Natural gas (MMBtu)  
Derivative [Line Items]  
Commodity, energy measures | MMBTU 2,367,896,824
Electricity (MWh)  
Derivative [Line Items]  
Commodity, energy measures 37,254,286
Oil (Gallons)  
Derivative [Line Items]  
Commodity, volume measure | gal 9,480,000
Foreign currency exchange ($ CAD)  
Derivative [Line Items]  
Commodity, monetary measure | $ $ 107,911,226
Renewable Energy Certificates (MWh)  
Derivative [Line Items]  
Commodity, energy measures 9,100,840
Carbon emissions (Metric Tons)  
Derivative [Line Items]  
Commodity, mass measure | T 447,324