Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 0	$ 53
Accounts receivable, net of allowance for doubtful accounts:
Oil and natural gas	271	220
Joint operations and other	223	238
Derivative instruments	4	4
Prepaid costs and other	37	31
Total current assets	535	546
Property and equipment:
Oil and natural gas properties, successful efforts method	20,754	18,476
Accumulated depletion and depreciation	(8,167)	(7,390)
Total oil and natural gas properties, net	12,587	11,086
Other property and equipment, net	232	216
Total property and equipment, net	12,819	11,302
Funds held in escrow	0	43
Deferred loan costs, net	14	11
Intangible asset - operating rights, net	24	24
Inventory	15	16
Noncurrent derivative instruments	28	0
Other assets	47	177
Total assets	13,482	12,119
Current liabilities:
Accounts payable - trade	36	28
Bank overdrafts	68	0
Revenue payable	135	132
Accrued drilling costs	381	359
Derivative instruments	37	82
Other current liabilities	153	152
Total current liabilities	810	753
Long-term debt	2,738	2,741
Deferred income taxes	1,150	766
Noncurrent derivative instruments	6	96
Asset retirement obligations and other long-term liabilities	147	140
Commitments and contingencies (Note 9)
Stockholders' equity:
Common stock, $0.001 par value; 300,000,000 authorized; 149,297,932 and 146,488,685 shares issued at September 30, 2017 and December 31, 2016, respectively	0	0
Additional paid-in capital	7,125	6,783
Retained earnings	1,573	884
Treasury stock, at cost; 597,551 and 429,708 shares at September 30, 2017 and December 31, 2016, respectively	(67)	(44)
Total stockholders' equity	8,631	7,623
Total liabilities and stockholders' equity	$ 13,482	$ 12,119