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

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