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Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts Outstanding) (Details) - 3 months ended Mar. 31, 2025 | CAD ($) MWh MMBTU T | USD ($)
--- | --- | ---
Natural gas (MMBtu) |  |
Derivative [Line Items] |  |
Commodity, energy measures | MMBTU | 2,285,028,944 |
Electricity (MWh) |  |
Derivative [Line Items] |  |
Commodity, energy measures | 45,449,172 |
Foreign currency exchange ($ CAD) |  |
Derivative [Line Items] |  |
Commodity, monetary measure | $ | $ 75,578,851 |
FTR (MWh) |  |
Derivative [Line Items] |  |
Commodity, energy measures | 28,094 |
Renewable Energy Certificates (MWh) |  |
Derivative [Line Items] |  |
Commodity, energy measures | 12,206,500 |
Carbon emissions (Metric Tons) |  |
Derivative [Line Items] |  |
Commodity, mass measure | T | 822,788 |
Interest rate contracts ($ USD) |  |
Derivative [Line Items] |  |
Commodity, monetary measure | $ |  | $ 400,000,000

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