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Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts Outstanding) (Details) - 3 months ended Mar. 31, 2024 | CAD ($) MWh MMBTU T gal | USD ($)
--- | --- | ---
Natural gas (MMBtu) |  |
Derivative [Line Items] |  |
Commodity, energy measures | MMBTU | 2,169,902,328 |
Electricity (MWh) |  |
Derivative [Line Items] |  |
Commodity, energy measures | 42,932,324 |
Oil (Gallons) |  |
Derivative [Line Items] |  |
Commodity, volume measure | gal | 3,204,000 |
Foreign currency exchange ($ CAD) |  |
Derivative [Line Items] |  |
Commodity, monetary measure | $ | $ 127,734,587 |
FTR (MWh) |  |
Derivative [Line Items] |  |
Commodity, energy measures | 29,452 |
Renewable Energy Certificates (MWh) |  |
Derivative [Line Items] |  |
Commodity, energy measures | 11,275,250 |
Carbon emissions (Metric Tons) |  |
Derivative [Line Items] |  |
Commodity, mass measure | T | 123,848 |
Interest rate contracts ($ USD) |  |
Derivative [Line Items] |  |
Commodity, monetary measure | $ |  | $ 950,000,000

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