Business Segment and Geographic Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Business Segment and Geographic Information [Abstract]
The number of business segments into which the company's operations are divided	2		2
Revenue:
Total revenue	$ 5,935	$ 4,387	$ 11,217	$ 8,148
Operating income:
Total operations	1,242	815	2,132	1,323
Corporate and other	(81)	(53)	(157)	(112)
Total operating income	1,161	762	1,975	1,211
Interest expense, net of interest income of $2, $3, $3, and $6	(63)	(76)	(132)	(152)
Other, net	(5)	(9)	(9)	(49)
Income from continuing operations before income taxes	1,093	677	1,834	1,010
Receivables
Gross trade receivables from United States (in hundredths)	43.00%		43.00%		36.00%
Completion and Production [Member]
Revenue:
Total revenue	3,618	2,393	6,790	4,357
Operating income:
Total operations	918	497	1,578	735
Drilling and Evaluation [Member]
Revenue:
Total revenue	2,317	1,994	4,427	3,791
Operating income:
Total operations	$ 324	$ 318	$ 554	$ 588

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The percentage of gross trade receivables that are from customers in the United States to total trade receivables as of the balance sheet date.

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- Definition

Sum of operating profit and nonoperating income (expense) before income taxes, extraordinary items, cumulative effects of changes in accounting principles, and amount attributed to noncontrolling interest.

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- Definition

The cost of borrowed funds accounted for as interest that was charged against earnings during the period net of interest income derived from investments in debt securities and on cash and cash equivalents the earnings of which reflect the time value of money or transactions in which the payments are for the use or forbearance of money.

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- Definition

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

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- Definition

The total amount of profit or loss for reportable segments, before unusual items, income taxes, and extraordinary items.

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- Definition

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

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- Definition

The net amount of other nonoperating income and expense, which does not qualify for separate disclosure on the income statement under materiality guidelines.

+ References

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

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- Definition

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.

+ References

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

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- Definition

Amount of an item in the reconciliation of total profit or loss from reportable segments, to the entity's consolidated income before income taxes, extraordinary items, discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-Paragraph 32
-Subparagraph b

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