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Derivatives and Risk Management Activities - Offsetting Asset and Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Derivative Assets    
Effect of Collateral Netting $ 36 $ 22
Commodity derivatives    
Derivative Assets    
Effect of Collateral Netting 36 22
Derivative Liabilities    
Gross Position - Asset 19 22
Gross Position - Liability (23) (25)
Net Carrying Value Presented on the Balance Sheet, Total 32 19
Other current assets | Commodity derivatives    
Derivative Assets    
Gross Position - Asset 14 25
Gross Position - Liability (14) (24)
Effect of Collateral Netting 36 22
Net Carrying Value Presented on the Balance Sheet 36 23
Other long-term assets, net | Commodity derivatives    
Derivative Assets    
Gross Position - Asset 1 0
Gross Position - Liability 0 0
Effect of Collateral Netting 0 0
Net Carrying Value Presented on the Balance Sheet 1 0
Other current liabilities | Commodity derivatives    
Derivative Liabilities    
Gross Position - Asset 0 (5)
Gross Position - Liability 0 5
Net Carrying Value Presented on the Balance Sheet 0 0
Other long-term liabilities and deferred credits | Commodity derivatives    
Derivative Assets    
Effect of Collateral Netting 0 0
Derivative Liabilities    
Gross Position - Asset 4 2
Gross Position - Liability (9) (6)
Net Carrying Value Presented on the Balance Sheet $ (5) $ (4)