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Derivative and Financial Instruments - Schedule of Net Exposures from Outstanding Commodity Derivative Contracts (Details) - Short - Commodity Contract - Bcf
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Natural Gas and Power, Fixed Price    
Trading Activity, Gains and Losses, Net [Line Items]    
Commodity derivatives - volumetric material net exposures (14) (12)
Natural Gas and Power, Basis    
Trading Activity, Gains and Losses, Net [Line Items]    
Commodity derivatives - volumetric material net exposures (6) (2)