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Derivatives and Risk Management Activities - Offsetting Asset and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivative Asset Positions
Effect of Collateral Netting	$ 269	$ 318
Commodity Derivatives
Derivative Asset Positions
Effect of Collateral Netting	269	318
Derivative Liability Positions
Gross Position - Asset	105	85
Gross Position - Liability	(475)	(386)
Net Carrying Value Presented on the Balance Sheet, Total	(101)	17
Other current assets | Commodity Derivatives
Derivative Asset Positions
Gross Position - Asset	97	71
Gross Position - Liability	(261)	(314)
Effect of Collateral Netting	269	318
Net Carrying Value Presented on the Balance Sheet	105	75
Other long-term assets, net | Commodity Derivatives
Derivative Asset Positions
Gross Position - Asset	4	5
Gross Position - Liability	0	0
Net Carrying Value Presented on the Balance Sheet	4	5
Other current liabilities | Commodity Derivatives
Derivative Liability Positions
Gross Position - Asset	3	9
Gross Position - Liability	(156)	(40)
Net Carrying Value Presented on the Balance Sheet	(153)	(31)
Other long-term liabilities and deferred credits | Commodity Derivatives
Derivative Liability Positions
Gross Position - Asset	1
Gross Position - Liability	(58)	(32)
Net Carrying Value Presented on the Balance Sheet	$ (57)	$ (32)

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