Product Guarantee (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Beginning balance	$ 293		$ 260		$ 239
Warranty expense	91		88		70
Payments	(58)		(56)		(51)
Adjustments	(7)	[1]	1	[1]	2	[1]
Ending balance	$ 319		$ 293		$ 260

[1] Includes reclassifications.