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Derivatives and Risk Management Activities - Offsetting Asset and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Derivative Asset Positions    
Effect of Collateral Netting $ 407 $ 318
Commodity Derivatives    
Derivative Asset Positions    
Effect of Collateral Netting 407 318
Derivative Liability Positions    
Gross Position - Asset 221 85
Gross Position - Liability (617) (386)
Net Carrying Value Presented on the Balance Sheet, Total 11 17
Other current assets | Commodity Derivatives    
Derivative Asset Positions    
Gross Position - Asset 205 71
Gross Position - Liability (430) (314)
Effect of Collateral Netting 407 318
Net Carrying Value Presented on the Balance Sheet 182 75
Other long-term assets, net | Commodity Derivatives    
Derivative Asset Positions    
Gross Position - Asset 6 5
Gross Position - Liability 0 0
Net Carrying Value Presented on the Balance Sheet 6 5
Other current liabilities | Commodity Derivatives    
Derivative Liability Positions    
Gross Position - Asset 3 9
Gross Position - Liability (97) (40)
Net Carrying Value Presented on the Balance Sheet (94) (31)
Other long-term liabilities and deferred credits | Commodity Derivatives    
Derivative Liability Positions    
Gross Position - Asset 7 0
Gross Position - Liability (90) (32)
Net Carrying Value Presented on the Balance Sheet $ (83) $ (32)