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Changes in Accrued Warranties and Related Costs (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 26, 2011	Mar. 31, 2012	Mar. 26, 2011
Product Liability Contingency [Line Items]
Beginning accrued warranty and related costs	$ 1,676	$ 904	$ 1,240	$ 761
Cost of warranty claims	(464)	(249)	(865)	(502)
Accruals for product warranty	466	448	1,303	844
Ending accrued warranty and related costs	$ 1,678	$ 1,103	$ 1,678	$ 1,103

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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