Net Gains or Losses Recognized on Economic Exposures Associated With Foreign Currency Exchange Contracts (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	$ 0	$ (143)	$ 0	$ (143)
Costs and Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	(333)	(5)	(548)	4
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	310	(22)	515	(44)
Net gains (losses)	(23)	(27)	(33)	(40)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	19	6	31	18
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	(17)	(11)	(29)	(21)
Net gains (losses)	$ 2	$ (5)	$ 2	$ (3)