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Derivative Financial Instruments, Investments and Fair Value Measurements - Schedule of Offsetting Assets and Liabilities (Details) - Commodity derivatives - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Current Assets
Derivative Assets
Commodity derivatives	$ 2	$ 1
Less: Counterparty netting	(1)	(1)
Total net fair value of derivatives	1	0
Current Liabilities
Derivative Liabilities
Commodity derivatives	(1)	(5)
Less: Counterparty netting	1	1
Total net fair value of derivatives	$ 0	$ (4)

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