The number of business segments into which the company's operations are divided.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

+ Details

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- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 10

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- Definition

The net amount of nonoperating interest income (expense).

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The net result for the period of deducting operating expenses from operating revenues.

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 1

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Subparagraph (SX 210.5-03.1)

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Business Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Completion and Production [Member]	Sep. 30, 2010 Completion and Production [Member]	Sep. 30, 2011 Completion and Production [Member]	Sep. 30, 2010 Completion and Production [Member]	Sep. 30, 2011 Drilling and Evaluation [Member]	Sep. 30, 2010 Drilling and Evaluation [Member]	Sep. 30, 2011 Drilling and Evaluation [Member]	Sep. 30, 2010 Drilling and Evaluation [Member]	Sep. 30, 2011 Total operations [Member]	Sep. 30, 2010 Total operations [Member]	Sep. 30, 2011 Total operations [Member]	Sep. 30, 2010 Total operations [Member]	Sep. 30, 2011 Corporate and other [Member]	Sep. 30, 2010 Corporate and other [Member]	Sep. 30, 2011 Corporate and other [Member]	Sep. 30, 2010 Corporate and other [Member]	Sep. 30, 2011 Gross Trade Receivables [Member]	Dec. 31, 2010 Gross Trade Receivables [Member]
Business Segment and Geographic Information [Abstract]
The number of business segments into which the company's operations are divided	2		2
Revenue:
Total revenue	$ 6,548	$ 4,665	$ 17,765	$ 12,813	$ 4,025	$ 2,655	$ 10,815	$ 7,012	$ 2,523	$ 2,010	$ 6,950	$ 5,801
Operating income:
Total operating income	1,332	818	3,307	2,029	1,068	609	2,646	1,344	369	271	923	859	1,437	880	3,569	2,203	(105)	(62)	(262)	(174)
Interest expense, net of interest income	(62)	(76)	(194)	(228)
Other, net	(9)	(7)	(18)	(56)
Income from continuing operations before income taxes	$ 1,261	$ 735	$ 3,095	$ 1,745
Receivables
Concentration risk (in hundredths)																					46.00%	36.00%