CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating Revenues:
Operating Revenues	$ 951	$ 737	$ 2,687	$ 2,394
Operating Costs and Expenses:
Operating expenses	206	170	588	481
General and administrative expenses	51	62	165	170
Restructuring charges	2		20
Depreciation, depletion and amortization	151	135	436	364
Impairments	161		161
Taxes, other than income taxes	26	24	64	75
Total Operating Costs and Expenses	885	627	2,242	1,830
Operating Income	66	110	445	564
Interest Expense:
Interest on debt	56	58	180	175
Other interest charges	2	2	6	7
Interest capitalized	(29)	(29)	(86)	(85)
Total Interest Expense	29	31	100	97
Gain (Loss) on Derivatives	(65)	45	(108)	295
Loss on Early Extinguishment of Debt		(59)	(8)	(70)
Other Income (Loss), Net	(1)	(2)	1	6
Income (Loss) Before Income Taxes	(29)	63	230	698
Benefit for Income Taxes:
Current		(10)		(10)
Deferred		(4)		(4)
Total Benefit for Income Taxes		(14)		(14)
Net Income (Loss)	(29)	77	230	712
Mandatory convertible preferred stock dividend		27		81
Participating securities - mandatory convertible preferred stock		7	1	83
Net Income (Loss) Attributable to Common Stock	$ (29)	$ 43	$ 229	$ 548
Earnings (Loss) Per Common Share:
Basic	$ (0.05)	$ 0.09	$ 0.40	$ 1.11
Diluted	$ (0.05)	$ 0.09	$ 0.39	$ 1.10
Weighted Average Common Shares Outstanding:
Basic	581,171,753	499,812,926	577,912,421	496,458,435
Diluted	581,171,753	502,290,779	579,828,858	498,527,671
Gas Sales [Member]
Operating Revenues:
Operating Revenues	$ 465	$ 394	$ 1,412	$ 1,368
Oil Sales [Member]
Operating Revenues:
Operating Revenues	62	27	141	73
NGL Sales [Member]
Operating Revenues:
Operating Revenues	112	55	252	132
Marketing [Member]
Operating Revenues:
Operating Revenues	287	233	805	736
Gas Gathering [Member]
Operating Revenues:
Operating Revenues	25	28	73	85
Other [Member]
Operating Revenues:
Operating Revenues			4
Natural Gas, Gathering, Transportation, Marketing and Processing [Member]
Operating Costs and Expenses:
Marketing purchases	$ 288	$ 236	$ 808	$ 740