Consolidated Statements of Operations (unaudited) (USD $) In Millions, except Per Share data	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues
Oil, Gas and NGL Sales	$ 895	$ 710	$ 1,725	$ 1,398
Income from Equity Method Investees	48	24	96	50
Other Revenues	11	17	33	36
Total	954	751	1,854	1,484
Costs and Expenses
Production Expense	155	150	296	289
Exploration Expense	68	52	138	132
Depreciation, Depletion and Amortization	235	215	456	431
General and Administrative	82	63	165	129
Asset Impairments	131	0	139	0
Other Operating (Income) Expense, Net	(11)	41	18	55
Total	660	521	1,212	1,036
Operating Income	294	230	642	448
Other (Income) Expense
(Gain) Loss on Commodity Derivative Instruments	(143)	(96)	143	(242)
Interest, Net of Amount Capitalized	21	19	37	39
Other Non-Operating (Income) Expense, Net	(9)	(13)	0	(13)
Total	(131)	(90)	180	(216)
Income Before Income Taxes	425	320	462	664
Income Tax Provision	131	116	154	223
Net Income	$ 294	$ 204	$ 308	$ 441
Earnings Per Share, Basic	$ 1.66	$ 1.17	$ 1.75	$ 2.53
Earnings Per Share, Diluted	$ 1.61	$ 1.10	$ 1.73	$ 2.44
Weighted Average Number of Shares Outstanding, Basic	176	175	176	175
Weighted Average Number of Shares Outstanding, Diluted	179	178	178	178