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Derivative and Financial Instruments - Schedule of Net Exposures from Outstanding Commodity Derivative Contracts (Details) - Short - Commodity Contract - Bcf | 9 Months Ended | 12 Months Ended
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Sep. 30, 2023 | Dec. 31, 2022
Natural Gas and Power, Fixed Price |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |
Commodity derivatives - volumetric material net exposures | (23) | (14)
Natural Gas and Power, Basis |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |
Commodity derivatives - volumetric material net exposures | (4) | (8)

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