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Derivative Instruments - Volumetric Underlying Derivative Transactions (Details) - Buy MWh in Thousands, MMBTU in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 MWh MMBTU | Dec. 31, 2021 MMBTU MWh
Gain on non-trading derivatives, net | Natural Gas |  |
Derivatives, Fair Value [Line Items] |  |
Net notional volume (energy measure) | 3,807 | 3,862
Gain on non-trading derivatives, net | Electricity |  |
Derivatives, Fair Value [Line Items] |  |
Net notional volume (energy measure) | MWh | 1,893 | 1,785
Gain (loss) on trading derivatives, net | Natural Gas |  |
Derivatives, Fair Value [Line Items] |  |
Net notional volume (energy measure) | 1,437 | 1,536

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