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. 01, 2016	Oct. 03, 2015	Sep. 27, 2014
Derivative [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	$ 0	$ 0	$ (143)
Costs and Expenses
Derivative [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	2	(574)	(269)
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	(65)	558	216
Net gains (losses)	(63)	(16)	(53)
Interest Income/(Expense)
Derivative [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	(2)	42	24
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	0	(43)	(24)
Net gains (losses)	(2)	(1)	0
Income Taxes [Member]
Derivative [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	49	40	34
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	(24)	0	0
Net gains (losses)	$ 25	$ 40	$ 34