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Restructuring Goodwill Impairments and Other Special Charges (Credits) Net - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Mar. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Restructuring and other special charges	$ 11	$ 11
Restructuring accruals recorded in accrued expenses		$ 78	$ 89

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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