Restructuring and Other Charges - Schedule of Restructuring and Other Charges (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Asset impairments	$ 40	$ 150	$ 139
Layoff costs	47	93	43
Other exit costs	21	61	58
Reversals of previously recorded layoff and other exit costs	(21)	(23)	(33)
Restructuring and other charges	$ 87	$ 281	$ 207