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Other Income/(Expense), Net (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 26, 2016
Mar. 28, 2015
Mar. 26, 2016
Mar. 28, 2015
Other Income Expense [Line Items]        
Interest and dividend income $ 986 $ 675 $ 1,927 $ 1,329
Interest expense (321) (163) (597) (294)
Other expense, net (510) (226) (773) (579)
Total other income/(expense), net $ 155 $ 286 $ 557 $ 456