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Restructuring Activities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 20	$ 4	$ 63	$ 57
Restructuring reserve	64		64		64
Restructuring actions for remaining liabilities, Current	$ 53		$ 53

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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