CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Revenues:
Total operating revenues	$ 1,072	$ 592
Operating Costs and Expenses:
Operating expenses	250	193
General and administrative expenses	38	26
Montage merger-related expenses	1	0
Restructuring charges	6	10
Depreciation, depletion and amortization	96	113
Impairments	0	1,479
Taxes, other than income taxes	24	13
Total operating costs and expense	771	2,082
Operating Income (Loss)	301	(1,490)
Interest Expense:
Interest on debt	50	40
Other interest charges	3	2
Interest capitalized	(22)	(23)
Total interest expense	31	19
Gain (Loss) on Derivatives	(191)	339
Gain on Early Extinguishment of Debt	0	28
Other Income, Net	1	1
Income (Loss) Before Income Taxes	80	(1,141)
Provision (Benefit) for Income Taxes:
Current	0	(2)
Deferred	0	408
Total provision (benefit) from income taxes	0	406
Net Income (Loss)	$ 80	$ (1,547)
Earnings (Loss) Per Common Share:
Basic (in dollars per share)	$ 0.12	$ (2.86)
Diluted (in dollars per share)	$ 0.12	$ (2.86)
Weighted Average Common Shares Outstanding:
Basic (in shares)	675,385,145	540,308,491
Diluted (in shares)	679,867,825	540,308,491
Gas sales
Operating Revenues:
Total operating revenues	$ 464	$ 248
Oil sales
Operating Revenues:
Total operating revenues	81	52
NGL sales
Operating Revenues:
Total operating revenues	173	50
Marketing
Operating Revenues:
Total operating revenues	352	239
Other
Operating Revenues:
Total operating revenues	2	3
Marketing purchases
Operating Costs and Expenses:
Marketing purchases	$ 356	$ 248