Goodwill and Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2011	Jun. 30, 2011	Dec. 31, 2011
Changes in carrying amount of goodwill
Balance as of December 31,2010		$ 5,869	$ 5,869
Purchase price adjustments for previous acquisitions		77
Acquisitions		5
Other Adjustments		2
Balance as of June 30, 2011	5,953	5,953
Goodwill and Intangible Assets (Textuals) [Abstract]
Minimum estimated useful lives of intangible assets		2
Maximum estimated useful lives of intangible assets		20
Minimum economic benefits of intangible assets are expected to be realized		15 years
Maximum economic benefits of intangible assets are expected to be realized		30 years
Amortization expense for intangible assets included in net income	24	46
Total current year expected amortization expense			90
Estimated amortization expense for the year 2012		95
Estimated amortization expense for the year 2013		94
Estimated amortization expense for the year 2014		93
Estimated amortization expense for the year 2015		88
Estimated amortization expense for the year 2016		87
North America [Member]
Changes in carrying amount of goodwill
Balance as of December 31,2010		2,731	2,731
Purchase price adjustments for previous acquisitions		314
Acquisitions		5
Other Adjustments		1
Balance as of June 30, 2011	3,051	3,051
Latin America [Member]
Changes in carrying amount of goodwill
Balance as of December 31,2010		879	879
Purchase price adjustments for previous acquisitions		(293)
Balance as of June 30, 2011	586	586
Europe / Africa / Russia Caspian [Member]
Changes in carrying amount of goodwill
Balance as of December 31,2010		936	936
Purchase price adjustments for previous acquisitions		86
Other Adjustments		1
Balance as of June 30, 2011	1,023	1,023
Middle East / Asia Pacific [Member]
Changes in carrying amount of goodwill
Balance as of December 31,2010		895	895
Purchase price adjustments for previous acquisitions		(42)
Other Adjustments		1
Balance as of June 30, 2011	854	854
Industrial Services and Other [Member]
Changes in carrying amount of goodwill
Balance as of December 31,2010		428	428
Purchase price adjustments for previous acquisitions		12
Other Adjustments		(1)
Balance as of June 30, 2011	$ 439	$ 439

Estimated amortization expense for the full fiscal year.

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Goodwill And Intangible Assets Textuals Abstract.

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Maximum economic benefits of intangible assets are expected to be realized.

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Aggregate amount of intangible asset amortization recognized as expense during the period.

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The maximum useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company.

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The amount of amortization expense expected to be recognized during year five of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year four of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year one of the five succeeding fiscal years.

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The amount of amortization expense expected to be recognized during year three of the five succeeding fiscal years.

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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.

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The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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Other increases or decreases during the reporting period in the carrying value of goodwill that are not separately disclosed.

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Purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value.

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