Derivative Instruments - Schedule of Volumetric Underlying Derivative Transactions (Details) - Buy MWh in Thousands, MMBTU in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2025 MMBTU MWh	Dec. 31, 2024 MWh MMBTU
(Loss) gain on non-trading derivatives, net \| Natural Gas
Derivatives, Fair Value [Line Items]
Net notional volume (energy measure)	5,634	5,716
(Loss) gain on non-trading derivatives, net \| Electricity
Derivatives, Fair Value [Line Items]
Net notional volume (energy measure) \| MWh	937	987
(Loss) gain on trading derivatives, net \| Natural Gas
Derivatives, Fair Value [Line Items]
Net notional volume (energy measure)	1,194	2,988

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.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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