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Derivatives and Risk Management Activities - Offsetting (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Derivative Asset Positions
Gross Position - Asset	$ 480	$ 90
Netting Adjustment	(192)	(239)
Cash collateral paid	(80)
Cash collateral received		212
Net Position - Asset	208	63
Derivative Liability Positions
Gross Position - Liability	(262)	(425)
Netting Adjustment	192	239
Net Position - Liability	(70)	(186)
Other current assets
Derivative Asset Positions
Gross Position - Asset	443	79
Net Position - Asset	181	62
Derivative Liability Positions
Gross Position - Liability	(182)	(229)
Other long-term assets, net
Derivative Asset Positions
Gross Position - Asset	34	1
Net Position - Asset	27	1
Derivative Liability Positions
Gross Position - Liability	(7)	0
Other current liabilities
Derivative Asset Positions
Gross Position - Asset		7
Derivative Liability Positions
Gross Position - Liability	(20)	(158)
Net Position - Liability	(20)	(151)
Other long-term liabilities and deferred credits
Derivative Asset Positions
Gross Position - Asset	3	3
Derivative Liability Positions
Gross Position - Liability	(53)	(38)
Net Position - Liability	$ (50)	$ (35)

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