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Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts) (Details) - 9 months ended Sep. 30, 2026	CAD ($) MMBTU MWh T	USD ($)
Natural gas (MMBtu)
Derivative [Line Items]
Commodity, energy measures \| MMBTU	2,666,446,533
Electricity (MWh)
Derivative [Line Items]
Commodity, energy measures	38,191,187
Foreign currency exchange ($ CAD)
Derivative [Line Items]
Commodity, monetary measure \| $	$ 59,282,723
FTR (MWh)
Derivative [Line Items]
Commodity, energy measures	84,768
Renewable Energy Certificates (MWh)
Derivative [Line Items]
Commodity, energy measures	12,344,728
Carbon emissions (Metric Tons)
Derivative [Line Items]
Commodity, mass measure \| T	1,571,305
Interest rate contracts ($ USD)
Derivative [Line Items]
Commodity, monetary measure \| $		$ 550,000,000