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. 29, 2012	Dec. 31, 2011
Costs and Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	$ 38	$ (70)
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	(48)	59
Net gains (losses)	(10)	(11)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	82	5
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	(84)	(5)
Net gains (losses)	$ (2)	$ 0