Derivatives and Risk Management Activities - Offsetting (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative Asset Positions
Effect of Collateral Netting (Liability)	$ 259	$ 318
Commodity derivatives
Derivative Asset Positions
Effect of Collateral Netting (Liability)	259	318
Derivative Liability Positions
Gross Position - Asset	100	85
Gross Position - Liability	(243)	(386)
Net Carrying Value Presented on the Balance Sheet, Total	116	17
Other current assets | Commodity derivatives
Derivative Asset Positions
Gross Position - Asset	90	71
Gross Position - Liability	(210)	(314)
Effect of Collateral Netting (Liability)	259	318
Net Carrying Value Presented on the Balance Sheet	139	75
Other long-term assets, net | Commodity derivatives
Derivative Asset Positions
Gross Position - Asset	3	5
Gross Position - Liability	0	0
Net Carrying Value Presented on the Balance Sheet	3	5
Other current liabilities | Commodity derivatives
Derivative Liability Positions
Gross Position - Asset	4	9
Gross Position - Liability	(24)	(40)
Net Carrying Value Presented on the Balance Sheet	(20)	(31)
Other long-term liabilities and deferred credits | Commodity derivatives
Derivative Liability Positions
Gross Position - Asset	3	0
Gross Position - Liability	(9)	(32)
Net Carrying Value Presented on the Balance Sheet	$ (6)	$ (32)