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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) $ in Millions	Sep. 30, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares
Preferred stock, par value (usd per share) | $ / shares	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares) | shares	20,000,000	20,000,000
Preferred stock, shares outstanding (shares) | shares	5,563,458	5,563,458
Common stock, par value (usd per share) | $ / shares	$ 0.01	$ 0.01
Common stock, shares authorized (shares) | shares	22,500,000	15,000,000
Common stock, shares issued (shares) | shares	9,780,371	9,772,793
Treasury stock, common shares (shares) | shares	0	26,224
VIE, cash and cash equivalents	$ 306	$ 6
VIE, proved oil and natural gas properties	31,511	30,765
VIE, accumulated depreciation, depletion and amortization	(29,399)	(20,002)
VIE, other current liabilities	753	1,432
VIE
VIE, cash and cash equivalents	2	2
VIE, proved oil and natural gas properties	755	755
VIE, accumulated depreciation, depletion and amortization	(748)	(713)
VIE, other current liabilities	$ 0	$ 1

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Oil and Gas properties with proved reserves under the successful effort method.

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