Consolidated Statements Of Operations (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	$ 2,200	$ 1,782	$ 4,060	$ 3,852
Oil, gas and NGL derivatives	416	45	248	665
Marketing and midstream revenues	604	405	1,059	935
Total revenues	3,220	2,232	5,367	5,452
Expenses and other, net:
Lease operating expenses	453	442	877	856
Taxes other than income taxes	120	92	228	193
Marketing and midstream operating costs and expenses	456	280	789	677
Depreciation, depletion and amortization of oil and gas properties	485	426	927	852
Depreciation and amortization of non-oil and gas properties	65	63	129	126
Accretion of asset retirement obligations	23	24	46	50
General and administrative expenses	135	130	265	268
Restructuring costs	6	(8)	1	(8)
Interest expense	85	111	166	197
Interest-rate and other financial instruments	25	81	8	66
Other, net	(11)	(22)	(27)	(26)
Total expenses and other, net	1,842	1,619	3,409	3,251
Earnings from continuing operations before income taxes	1,378	613	1,958	2,201
Income tax expense (benefit):
Current	36	707	(53)	1,006
Deferred	1,158	(446)	1,438	(231)
Total income tax expense	1,194	261	1,385	775
Earnings from continuing operations	184	352	573	1,426
Discontinued operations:
Earnings from discontinued operations before income taxes	2,558	473	2,588	610
Discontinued operations income tax (benefit) expense	(1)	119	2	138
Earnings from discontinued operations	2,559	354	2,586	472
Net earnings	$ 2,743	$ 706	$ 3,159	$ 1,898
Basic net earnings per share:
Basic earnings from continuing operations per share	$ 0.44	$ 0.79	$ 1.35	$ 3.20
Basic earnings from discontinued operations per share	$ 6.06	$ 0.80	$ 6.09	$ 1.06
Basic net earnings per share	$ 6.50	$ 1.59	$ 7.44	$ 4.26
Diluted net earnings per share:
Diluted earnings from continuing operations per share	$ 0.43	$ 0.79	$ 1.34	$ 3.19
Diluted earnings from discontinued operations per share	$ 6.05	$ 0.79	$ 6.07	$ 1.05
Diluted net earnings per share	$ 6.48	$ 1.58	$ 7.41	$ 4.24

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Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

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Revenue from the sale of oil and gas during the period.

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- Definition

The other noncash expense, not otherwise specified in the taxonomy, charged against earnings in the period to allocate the cost of tangible and intangible assets over their remaining economic lives.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 5
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section S99
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-Subparagraph (SX 210.5-03.9)
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Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Topic 225
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-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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- Definition

All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax.

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