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Derivatives and Risk Management Activities - Offsetting (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Derivative Asset Positions
Gross Position - Asset	$ 485	$ 480
Netting adjustment	(128)	(192)
Cash collateral received	(130)	(80)
Net Position - Asset	227	208
Derivative Liability Positions
Gross Position - Liability	(176)	(262)
Netting adjustment	128	192
Net Position - Liability	(48)	(70)
Other current assets
Derivative Asset Positions
Gross Position - Asset	450	443
Net Position - Asset	199	181
Derivative Liability Positions
Gross Position - Liability	(121)	(182)
Other long-term assets, net
Derivative Asset Positions
Gross Position - Asset	31	34
Net Position - Asset	28	27
Derivative Liability Positions
Gross Position - Liability	(3)	(7)
Other current liabilities
Derivative Asset Positions
Gross Position - Asset	1
Derivative Liability Positions
Gross Position - Liability	(15)	(20)
Net Position - Liability	(14)	(20)
Other long-term liabilities and deferred credits
Derivative Asset Positions
Gross Position - Asset	3	3
Derivative Liability Positions
Gross Position - Liability	(37)	(53)
Net Position - Liability	$ (34)	$ (50)

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