Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 771	$ 53
Accounts receivable, net of allowance for doubtful accounts:
Oil and natural gas	239	220
Joint operations and other	248	238
Derivative instruments	55	4
Prepaid costs and other	40	31
Total current assets	1,353	546
Property and equipment:
Oil and natural gas properties, successful efforts method	19,287	18,476
Accumulated depletion and depreciation	(7,667)	(7,390)
Total oil and natural gas properties, net	11,620	11,086
Other property and equipment, net	209	216
Total property and equipment, net	11,829	11,302
Funds held in escrow	0	43
Deferred loan costs, net	10	11
Intangible asset - operating rights, net	24	24
Inventory	14	16
Noncurrent derivative instruments	42	0
Other assets	47	177
Total assets	13,319	12,119
Accounts payable:
Trade	35	28
Related parties	0	0
Revenue payable	139	132
Accrued and prepaid drilling costs	445	359
Derivative instruments	10	82
Other current liabilities	151	152
Total current liabilities	780	753
Long-term debt	2,741	2,741
Deferred income taxes	1,122	766
Noncurrent derivative instruments	3	96
Asset retirement obligations and other long-term liabilities	141	140
Commitments and contingencies (Note 9)
Stockholders' equity:
Common stock, $0.001 par value; 300,000,000 authorized; 148,752,676 and 146,488,685 shares issued at March 31, 2017 and December 31, 2016, respectively	0	0
Additional paid-in capital	7,061	6,783
Retained earnings	1,534	884
Treasury stock, at cost; 578,633 and 429,708 shares at March 31, 2017 and December 31, 2016, respectively	(63)	(44)
Total stockholders' equity	8,532	7,623
Total liabilities and stockholders' equity	$ 13,319	$ 12,119