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Restructuring Activities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Restructuring And Related Activities [Abstract]
Restructuring charges	$ 6	$ 20	$ 43	$ 63
Restructuring reserve	54		54		99
Restructuring actions for remaining liabilities, Current	$ 44		$ 44

- 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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