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Derivatives and Risk Management Activities - Offsetting (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Derivative Asset Positions
Gross Position - Asset	$ 437	$ 480
Netting adjustment	(74)	(192)
Cash collateral received	(110)	(80)
Net Position - Asset	253	208
Derivative Liability Positions
Gross Position - Liability	(184)	(262)
Netting adjustment	74	192
Net Position - Liability	(110)	(70)
Other current assets
Derivative Asset Positions
Gross Position - Asset	376	443
Net Position - Asset	199	181
Derivative Liability Positions
Gross Position - Liability	(67)	(182)
Other long-term assets, net
Derivative Asset Positions
Gross Position - Asset	59	34
Net Position - Asset	54	27
Derivative Liability Positions
Gross Position - Liability	(5)	(7)
Other current liabilities
Derivative Asset Positions
Gross Position - Asset	2
Derivative Liability Positions
Gross Position - Liability	(79)	(20)
Net Position - Liability	(77)	(20)
Other long-term liabilities and deferred credits
Derivative Asset Positions
Gross Position - Asset		3
Derivative Liability Positions
Gross Position - Liability	(33)	(53)
Net Position - Liability	$ (33)	$ (50)

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