Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
REVENUES
Oil, natural gas and NGL sales	$ 628	$ 432
Net loss from commodity derivatives	(562)	(213)
Total operating revenues	153	363
OPERATING EXPENSES
Operating costs	182	164
General and administrative expenses	48	48
Depreciation, depletion and amortization	49	52
Asset impairments	0	3
Taxes other than on income	34	40
Exploration expense	1	2
Accretion expense	11	13
Other operating expenses, net	14	17
Total operating expenses	396	436
Net gain on asset divestitures	54	0
OPERATING LOSS	(189)	(73)
NON-OPERATING (EXPENSES) INCOME
Reorganization items, net	0	(2)
Interest and debt expense, net	(13)	(13)
Net loss on early extinguishment of debt	0	(2)
Other non-operating expenses, net	1	1
LOSS BEFORE INCOME TAXES	(201)	(89)
Income taxes	26	0
NET LOSS	(175)	(89)
Less: net income attributable to noncontrolling interests	0	(5)
NET LOSS ATTRIBUTABLE TO COMMON STOCK	$ (175)	$ (94)
Net loss attributable to common stock per share
Basic (in dollars per share)	$ (2.23)	$ (1.13)
Diluted (in dollars per share)	$ (2.23)	$ (1.13)
Weighted-average common shares outstanding
Basic (in shares)	78.5	83.3
Diluted (in shares)	78.5	83.3
Sales of purchased natural gas
REVENUES
Revenue not from contract with customer	$ 32	$ 98
OPERATING EXPENSES
Costs of sales	21	61
Electricity sales
REVENUES
Revenue not from contract with customer	34	33
Other revenue
REVENUES
Revenue not from contract with customer	21	13
Electricity generation expenses
OPERATING EXPENSES
Costs of sales	24	24
Transportation costs
OPERATING EXPENSES
Costs of sales	$ 12	$ 12