Description of Business, Accounting Policies, and Supplemental Disclosures - Derivative Instruments (Details) MWh in Millions	12 Months Ended
Dec. 31, 2025 MWh
Derivative [Line Items]
Energy contract quantity	200
Period for which the majority of mega-watt hours is expected to be delivered	9 years
Maximum
Derivative [Line Items]
Derivative term	20 years
Maximum \| Electric Future Prices \| Fair Value, Inputs, Level 1 and Level 2
Derivative [Line Items]
Derivative, remaining maturity	5 years
Maximum \| Various Management Assumptions \| Fair Value, Inputs, Level 3
Derivative [Line Items]
Derivative, remaining maturity	5 years
Minimum \| Electric Future Prices \| Fair Value, Inputs, Level 1 and Level 2
Derivative [Line Items]
Derivative, remaining maturity	4 years
Minimum \| Various Management Assumptions \| Fair Value, Inputs, Level 3
Derivative [Line Items]
Derivative, remaining maturity	4 years
Weighted Average
Derivative [Line Items]
Derivative term	16 years

Derivative, Minimum Fulfillment Period For Majority Of Contracts

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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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- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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- Definition

Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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