Derivative Instruments - Net Gains or Losses Recognized in Costs and Expenses on Economic Exposures Associated with Foreign Currency Exchange Rates (Detail) - USD ($) $ in Millions	12 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Sep. 28, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	$ 0	$ (143)	$ 0
Costs and Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	(574)	(269)	(33)
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	558	216	(8)
Net gains (losses)	(16)	(53)	(41)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	42	24	199
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	(43)	(24)	(194)
Net gains (losses)	$ (1)	$ 0	$ 5