Derivative Accounting - Schedule of Outstanding Gross Notional Amounts Outstanding (Details) - Commodity Contracts MWh in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2026 MWh Bcf	Dec. 31, 2025 MWh Bcf
Outstanding gross notional amount of derivatives
Power \| MWh	408	542
Gas \| Bcf	246,000	211,000

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-5

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