Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
CURRENT ASSETS
Cash and cash equivalents	$ 28	$ 12
Trade receivables	221	232
Inventories	58	58
Other current assets, net	145	123
Total current assets	452	425
PROPERTY, PLANT AND EQUIPMENT	21,124	20,915
Accumulated depreciation, depletion and amortization	(15,432)	(15,030)
Total property, plant and equipment, net	5,692	5,885
OTHER ASSETS	39	44
TOTAL ASSETS	6,183	6,354
CURRENT LIABILITIES
Current maturities of long-term debt	100	100
Accounts payable	263	219
Accrued liabilities	383	407
Total current liabilities	746	726
LONG-TERM DEBT - PRINCIPAL AMOUNT	5,039	5,168
DEFERRED GAIN AND ISSUANCE COSTS, NET	356	397
OTHER LONG-TERM LIABILITIES	616	620
EQUITY
Preferred stock (20 million shares authorized at $0.01 par value) no shares outstanding at September 30, 2017 and December 31, 2016
Common stock (200 million shares authorized at $0.01 par value) outstanding shares (September 30, 2017 - 42,868,072 and December 31, 2016 - 42,542,637)
Additional paid-in capital	4,875	4,861
Accumulated deficit	(5,532)	(5,404)
Accumulated other comprehensive loss	(10)	(14)
Total equity attributable to common stock	(667)	(557)
Noncontrolling interest	93
Total equity	(574)	(557)
TOTAL LIABILITIES AND EQUITY	$ 6,183	$ 6,354