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Derivatives and Risk Management Activities - Offsetting (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Derivative Asset Positions
Gross Position - Asset	$ 436	$ 480
Netting adjustment	(107)	(192)
Cash collateral received	(73)	(80)
Net Position - Asset	256	208
Derivative Liability Positions
Gross Position - Liability	(187)	(262)
Netting adjustment	107	192
Net Position - Liability	(80)	(70)
Other current assets
Derivative Asset Positions
Gross Position - Asset	393	443
Net Position - Asset	223	181
Derivative Liability Positions
Gross Position - Liability	(97)	(182)
Other long-term assets, net
Derivative Asset Positions
Gross Position - Asset	37	34
Net Position - Asset	33	27
Derivative Liability Positions
Gross Position - Liability	(4)	(7)
Other current liabilities
Derivative Liability Positions
Gross Position - Liability	(51)	(20)
Net Position - Liability	(51)	(20)
Other long-term liabilities and deferred credits
Derivative Asset Positions
Gross Position - Asset	6	3
Derivative Liability Positions
Gross Position - Liability	(35)	(53)
Net Position - Liability	$ (29)	$ (50)

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