Other Income/(Expense), Net (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 26, 2015	Dec. 27, 2014
Other Income Expense [Line Items]
Interest and dividend income	$ 941	$ 654
Interest expense	(276)	(131)
Other expense, net	(263)	(353)
Total other income/(expense), net	$ 402	$ 170