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Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts Outstanding) (Details)
9 Months Ended
Sep. 30, 2022
CAD ($)
MWh
MMBTU
T
gal
Natural gas (MMBtu)  
Derivative [Line Items]  
Commodity, energy measures | MMBTU 2,218,333,992
Electricity (MWh)  
Derivative [Line Items]  
Commodity, energy measures 30,593,651
Oil (Gallons)  
Derivative [Line Items]  
Commodity, volume measure | gal 8,532,000
Foreign currency exchange ($ CAD)  
Derivative [Line Items]  
Commodity, monetary measure | $ $ 132,812,314
Renewable Energy Certificates (MWh)  
Derivative [Line Items]  
Commodity, energy measures 7,816,573
Carbon emissions (Metric Tons)  
Derivative [Line Items]  
Commodity, mass measure | T 592,605