Adjustments Related to Fair Value Hedges Included in Net Interest Expense in Consolidated Statements of Income (Details) (Interest rate, Interest Expense, USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 29, 2012	Dec. 31, 2011
Interest rate | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest rate swaps	$ (26)	$ (4)
Gain (loss) on hedged borrowings	$ 26	$ 4