Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts Outstanding) (Details)	12 Months Ended
	Dec. 31, 2021 CAD ($) MWh MMBTU T
Natural gas (MMBtu)
Derivative [Line Items]
Commodity, energy measure | MMBTU	2,139,606,569
Electricity (MWh)
Derivative [Line Items]
Commodity, energy measure	32,140,743
Foreign currency exchange ($ CAD)
Derivative [Line Items]
Commodity, monetary measure | $	$ 116,073,431
Renewable Energy Certificates (MWh)
Derivative [Line Items]
Commodity, energy measure	7,711,766
Carbon emissions (Metric Ton)
Derivative [Line Items]
Commodity, mass measure | T	1,142,009