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		6 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Mar. 30, 2013	Mar. 31, 2012
Interest rate | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest rate swaps	$ (38)	$ (12)	$ (64)	$ (16)
Gain (loss) on hedged borrowings	$ 38	$ 12	$ 64	$ 16