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Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts) (Details) - 6 months ended Jun. 30, 2026	CAD ($) MMBTU MWh T	USD ($)
Natural gas (MMBtu)
Derivative [Line Items]
Commodity, energy measures \| MMBTU	2,625,986,076
Electricity (MWh)
Derivative [Line Items]
Commodity, energy measures	45,340,648
Foreign currency exchange ($ CAD)
Derivative [Line Items]
Commodity, monetary measure \| $	$ 63,581,485
FTR (MWh)
Derivative [Line Items]
Commodity, energy measures	123,329
Renewable Energy Certificates (MWh)
Derivative [Line Items]
Commodity, energy measures	13,325,517
Carbon emissions (Metric Tons)
Derivative [Line Items]
Commodity, mass measure \| T	768,229
Interest rate contracts ($ USD)
Derivative [Line Items]
Commodity, monetary measure \| $		$ 550,000,000