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Financial and Other Derivative Instruments (Cumulative Gross Volume of Derivative Contracts) (Details) - 9 months ended Sep. 30, 2025	CAD ($) MWh MMBTU T	USD ($)
Natural gas (MMBtu)
Derivative [Line Items]
Commodity, energy measures | MMBTU	2,291,617,186
Electricity (MWh)
Derivative [Line Items]
Commodity, energy measures	40,367,854
Foreign currency exchange ($ CAD)
Derivative [Line Items]
Commodity, monetary measure | $	$ 74,745,468
FTR (MWh)
Derivative [Line Items]
Commodity, energy measures	129,597
Renewable Energy Certificates (MWh)
Derivative [Line Items]
Commodity, energy measures	13,426,465
Carbon emissions (Metric Tons)
Derivative [Line Items]
Commodity, mass measure | T	1,655,907
Interest rate contracts ($ USD)
Derivative [Line Items]
Commodity, monetary measure | $		$ 100,000,000

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-5

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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480401/815-10-55-181

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-1B

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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