CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Operating Revenues:
Gas sales	$ 1,793		$ 1,273	$ 1,946
Oil sales	102		69	76
NGL sales	206		92	73
Marketing	972		864	863
Gas gathering	126		138	175
Other	4
Total Operating Revenues	3,203		2,436	3,133
Operating Costs and Expenses:
Marketing purchases	976		864	852
Operating expenses	671		592	689
General and administrative expenses	233		247	246
Restructuring charges			78
Depreciation, depletion and amortization	504		436	1,091
Impairment of natural gas and oil properties	0		2,321	6,950
Gain on sale of assets, net	(6)			(283)
Taxes, other than income taxes	94		93	110
Total Operating Costs and Expenses	2,472		4,631	9,655
Operating Income (Loss)	731		(2,195)	(6,522)
Interest Expense:
Interest on debt	239		226	200
Other interest charges	9		14	60
Interest capitalized	(113)		(152)	(204)
Total Interest Expense	135		88	56
Gain (Loss) on Derivatives	422		(339)	47
Loss on Early Extinguishment of Debt	(70)		(51)
Other Income (Loss), Net	5		1	(30)
Income (Loss) Before Income Taxes	953		(2,672)	(6,561)
Benefit for Income Taxes:
Current	(22)		(7)	(2)
Deferred	(71)		(22)	(2,003)
Benefit for Income Taxes	(93)		(29)	(2,005)
Net Income (Loss)	1,046	[1]	(2,643)	(4,556)
Mandatory convertible preferred stock dividend	108		108	106
Participating securities - mandatory convertible preferred stock	123
Net Income (Loss) Attributable to Common Stock	$ 815		$ (2,751)	$ (4,662)
Earnings (Loss) Per Common Share:
Basic	$ 1.64		$ (6.32)	$ (12.25)
Diluted	$ 1.63		$ (6.32)	$ (12.25)
Weighted Average Common Shares Outstanding:
Basic	498,264,321		435,337,402	380,521,039
Diluted	500,804,297		435,337,402	380,521,039

[1] In 2017, deferred tax activity incurred in other comprehensive income was offset by a valuation allowance.