Consolidated and Combined Statements of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
REVENUES
Oil and natural gas sales to related parties	$ 2,617	$ 4,054	$ 3,878
Oil and natural gas sales to third parties	1,406	85	89
Other revenue	150	145	106
TOTAL REVENUES	4,173	4,284	4,073
COSTS AND OTHER DEDUCTIONS
Production costs	1,023	960	1,219
Selling, general and administrative expenses	336	292	273
Depreciation, depletion and amortization	1,198	1,144	926
Asset impairments	3,402		29
Taxes other than on income	217	185	167
Exploration expense	139	116	148
Interest and debt expense, net	72
Other expenses	207	140	130
TOTAL COSTS AND OTHER DEDUCTIONS	6,594	2,837	2,892
INCOME / (LOSS) BEFORE INCOME TAXES	(2,421)	1,447	1,181
Income tax (expense) / benefit	987	(578)	(482)
NET INCOME / (LOSS)	$ (1,434)	$ 869	$ 699
Net income / (loss) per share of common stock
Basic (in dollars per share)	$ (3.75)	$ 2.24	$ 1.80
Diluted (in dollars per share)	$ (3.75)	$ 2.24	$ 1.80