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Segment, Geographic and Other Revenue Information - Narrative (Detail) (USD $) In Millions, unless otherwise specified	93 Months Ended
	Sep. 30, 2012 Operating_segments	Dec. 31, 2011
Segment Reporting Information [Line Items]
Number of operating segments (in operating segments)	5
Total assets	$ 182,603	$ 188,002

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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