Other Income and Expense (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Other Income Expense [Line Items]
Interest and dividend income	$ 427	$ 421
Interest expense	(84)	0
Other expense, net	(97)	41
Total other income/(expense), net	$ 246	$ 462