Net Gains or Losses Recognized on Economic Exposures Associated With Foreign Currency Exchange Contracts (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Costs and Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	$ 9	$ 38
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	(22)	(48)
Net gains (losses)	(13)	(10)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	12	82
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	(10)	(84)
Net gains (losses)	$ 2	$ (2)