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Derivative Financial Instruments - Schedule of Offsetting Assets and Liabilities (Details) - Commodity Derivatives - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Current Assets
Derivative Assets
Commodity Derivatives	$ 3	$ 8
Less: Counterparty Netting	(1)	(1)
Total Net Fair Value of Derivatives	2	7
Current Liabilities
Derivative Liabilities
Commodity Derivatives	1	1
Less: Counterparty Netting	(1)	(1)
Total Net Fair Value of Derivatives	$ 0	$ 0

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