Acquisitions (Details Textual) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
Apr. 30, 2010	Mar. 31, 2011	Apr. 28, 2010
Acquisitions (Textuals) [Abstract]
Percentage of outstanding common stock acquired of BJ Services			100.00%
Acquisition of outstanding common stock in consideration of cash and stock transaction			$ 6,897
Total amount of cash paid for acquisition			793
Total amount of shares issued for acquisition	118
Total valuation of shares issued based upon the closing price of common stock			6,048
BJ Stock options exchanged at fair value			56
Increase in fair value of noncontrolling interests		68
Decrease in fair value of deferred tax liabilities and other taxes		21
Adjustment related to deferred taxes and other tax liabilities at fair value		1,262
Adjustment related to noncontrolling interests at fair value		202
Goodwill recorded as the excess of consideration transferred			$ 4,406

Adjustment related to deferred taxes and other tax liabilities at fair value.

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Adjustment Related To Noncontrolling Interests At Fair Value.

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Decrease in fair value of deferred tax liabilities and other taxes related to acquisition.

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Increase in fair value of noncontrolling interests related to acquisition.

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Amount of cash paid to acquire the entity.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

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Fair value of noncash consideration given by the acquirer to acquire the entity. Does not include cash paid, the fair value of debt and securities issued and liabilities incurred to acquire the entity.

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

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

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-Name Emerging Issues Task Force (EITF)

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Number of shares of equity interests issued or issuable to acquire entity.

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Percentage of voting equity interests acquired in the business combination.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 52

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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.

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