Other Income and Expense (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 29, 2014	Mar. 30, 2013	Mar. 29, 2014	Mar. 30, 2013
Other Income Expense [Line Items]
Interest and dividend income	$ 410	$ 420	$ 837	$ 841
Interest expense	(85)	0	(169)	0
Other expense, net	(100)	(73)	(197)	(32)
Total other income/(expense), net	$ 225	$ 347	$ 471	$ 809