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. 30, 2013	Mar. 31, 2012	Mar. 30, 2013	Mar. 31, 2012
Costs and Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	$ (145)	$ 54	$ (107)	$ (16)
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	142	(63)	94	(4)
Net gains (losses)	(3)	(9)	(13)	(20)
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on foreign currency denominated assets and liabilities	71	38	153	43
Net gains (losses) on foreign exchange risk management contracts not designated as hedges	(67)	(43)	(151)	(48)
Net gains (losses)	$ 4	$ (5)	$ 2	$ (5)