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Other Income/(Expense), Net (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 28, 2013
Other Income Expense [Line Items]      
Interest and dividend income $ 2,921 $ 1,795 $ 1,616
Interest expense (733) (384) (136)
Other expense, net (903) (431) (324)
Total other income/(expense), net $ 1,285 $ 980 $ 1,156