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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

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