Net Gains or Losses Recognized on Economic Exposures Associated With Foreign Currency Exchange Contracts (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Costs and Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	$ 148	$ (75)	$ 25	$ (29)
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	(144)	52	(26)	(32)
Net gains (losses)	4	(23)	(1)	(61)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	(7)	(2)	(3)	(7)
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	6	1	2	5
Net gains (losses)	(1)	(1)	(1)	(2)
Income Taxes
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	4	15	16	42
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	21	(19)	4	(19)
Net gains (losses)	$ 25	$ (4)	$ 20	$ 23