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Derivatives and Risk Management Activities - Offsetting (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivative Asset Positions
Gross Position - Asset	$ 239	$ 480
Netting Adjustment	(71)	(192)
Cash collateral paid/(received)	(45)	(80)
Net Position - Asset	123	208
Derivative Liability Positions
Gross Position - Liability	(186)	(262)
Netting Adjustment	71	192
Net Position - Liability	(115)	(70)
Other current assets
Derivative Asset Positions
Gross Position - Asset	183	443
Net Position - Asset	99	181
Derivative Liability Positions
Gross Position - Liability	(39)	(182)
Other long-term assets, net
Derivative Asset Positions
Gross Position - Asset	24	34
Net Position - Asset	24	27
Derivative Liability Positions
Gross Position - Liability		(7)
Other current liabilities
Derivative Asset Positions
Gross Position - Asset	32
Derivative Liability Positions
Gross Position - Liability	(101)	(20)
Net Position - Liability	(69)	(20)
Other long-term liabilities and deferred credits
Derivative Asset Positions
Gross Position - Asset		3
Derivative Liability Positions
Gross Position - Liability	(46)	(53)
Net Position - Liability	$ (46)	$ (50)

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