Goodwill and Intangible Assets (Details) (USD $) In Millions	9 Months Ended
Sep. 30, 2011
Changes in carrying amount of goodwill
Balance as of December 31,2010	$ 5,869
Purchase price adjustments for previous acquisitions	77
Acquisitions	4
Other Adjustments	(3)
Balance as of September 30, 2011	5,947
North America [Member]
Changes in carrying amount of goodwill
Balance as of December 31,2010	2,731
Purchase price adjustments for previous acquisitions	314
Acquisitions	4
Other Adjustments	(3)
Balance as of September 30, 2011	3,046
Latin America [Member]
Changes in carrying amount of goodwill
Balance as of December 31,2010	879
Purchase price adjustments for previous acquisitions	(293)
Balance as of September 30, 2011	586
Europe / Africa / Russia Caspian [Member]
Changes in carrying amount of goodwill
Balance as of December 31,2010	936
Purchase price adjustments for previous acquisitions	86
Balance as of September 30, 2011	1,022
Middle East / Asia Pacific [Member]
Changes in carrying amount of goodwill
Balance as of December 31,2010	895
Purchase price adjustments for previous acquisitions	(42)
Balance as of September 30, 2011	853
Industrial Services and Other [Member]
Changes in carrying amount of goodwill
Balance as of December 31,2010	428
Purchase price adjustments for previous acquisitions	12
Balance as of September 30, 2011	$ 440

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

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-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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Subparagraph l

-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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e

-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 Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 34

-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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-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.

+ Details