Derivative Accounting - Schedule of Outstanding Gross Notional Amounts Outstanding (Details) - Commodity Contracts MWh in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2025 MWh Bcf	Dec. 31, 2024 MWh Bcf
Outstanding gross notional amount of derivatives
Power \| MWh	619	1,051
Gas \| Bcf	241,000	235,000

Nominal volume used to calculate payments on a derivative instrument.

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

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