Statement of Consolidated Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
REVENUES AND OTHER:
Oil and gas production revenues	$ 4,119	$ 3,956	$ 8,265	$ 8,413
Derivative instrument gains (losses), net	247		147
Other	17	16	47	95
Total revenues and other	4,383	3,972	8,459	8,508
Oil and gas property and equipment
Recurring	1,311	1,194	2,576	2,329
Additional		648	65	1,169
Other Assets	93	90	198	174
Asset retirement obligation accretion	65	57	130	112
Lease operating expenses	829	704	1,600	1,377
Gathering and transportation	80	72	154	149
Taxes other than income	183	203	425	460
General and administrative	133	132	249	260
Merger, acquisitions & transition		16		22
Financing costs, net	51	45	104	85
Total operating expenses	2,745	3,161	5,501	6,137
INCOME BEFORE INCOME TAXES	1,638	811	2,958	2,371
Current income tax provision	284	460	781	1,185
Deferred income tax provision (benefit)	319	(5)	425	33
NET INCOME	1,035	356	1,752	1,153
Preferred stock dividends	19	19	38	38
INCOME ATTRIBUTABLE TO COMMON STOCK	$ 1,016	$ 337	$ 1,714	$ 1,115
NET INCOME PER COMMON SHARE:
Basic	$ 2.59	$ 0.87	$ 4.37	$ 2.88
Diluted	$ 2.54	$ 0.86	$ 4.30	$ 2.86
WEIGHTED-AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
Basic	392	389	392	387
Diluted	408	390	408	403
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.20	$ 0.17	$ 0.40	$ 0.34