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Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts Outstanding) (Details) - 12 months ended Dec. 31, 2022 | CAD ($) MWh MMBTU T gal | USD ($)
--- | --- | ---
Natural gas (MMBtu) |  |
Derivative [Line Items] |  |
Commodity, energy measure | MMBTU | 2,099,176,239 |
Electricity (MWh) |  |
Derivative [Line Items] |  |
Commodity, energy measure | 33,018,171 |
Oil (Gallons) |  |
Derivative [Line Items] |  |
Commodity, volume measure | gal | 7,584,000 |
Foreign currency exchange ($ CAD) |  |
Derivative [Line Items] |  |
Commodity, monetary measure | $ | $ 164,965,288 |
FTR (MWh) |  |
Derivative [Line Items] |  |
Commodity, energy measure | 60,482 |
Renewable Energy Certificates (MWh) |  |
Derivative [Line Items] |  |
Commodity, energy measure | 7,340,257 |
Carbon emissions (Metric Ton) |  |
Derivative [Line Items] |  |
Commodity, mass measure | T | 140,639 |
Interest rate contracts ($ USD) |  |
Derivative [Line Items] |  |
Commodity, monetary measure | $ |  | $ 800,000,000

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