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Restructuring (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 7	$ 26	$ 1
Worldwide Restructuring Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees terminated during the period		350
Restructuring charges		26
Subsequent Event [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 40

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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