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. 27, 2014	Dec. 28, 2013
Interest rate | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on interest rate swaps	$ 10	$ (31)
Gain (loss) on hedged borrowings	$ (10)	$ 31