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Derivative Instruments - Volumetric Underlying Derivative Transactions (Details) - Buy MWh in Thousands, MMBTU in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 MMBTU MWh | Dec. 31, 2021 MMBTU MWh
(Loss) gain on non-trading derivatives, net | Natural Gas |  |
Derivatives, Fair Value [Line Items] |  |
Net notional volume (energy measure) | 4,090 | 3,862
(Loss) gain on non-trading derivatives, net | Electricity |  |
Derivatives, Fair Value [Line Items] |  |
Net notional volume (energy measure) | MWh | 1,891 | 1,785
(Loss) gain on trading derivatives, net | Natural Gas |  |
Derivatives, Fair Value [Line Items] |  |
Net notional volume (energy measure) | 2,076 | 1,536

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