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Warranty Accrual Rollforward (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Warranty Accrual Rollforward [Line Items]
Product warranty accrual, beginning balance	$ 26	$ 33
Product warranty accrual, warranties issued	10	7
Product warranty accrual, reductions for payments made	(13)	(13)
Product Warranty accrual, ending balance	$ 23	$ 27

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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