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Activity in Warranty Accrual for Product Warranty (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance, beginning of the period	$ 274	$ 283	$ 289	$ 278
Provision	32	51	74	96
Amounts charged to the accrual	(51)	(43)	(108)	(83)
Balance, end of the period	$ 255	$ 291	$ 255	$ 291

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. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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