Notional Principal Amounts of Outstanding Derivative Instruments and Credit Risk Amounts Associated with Outstanding or Unsettled Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012
Derivatives Designated as Hedging Instruments | Foreign exchange contracts
Derivative [Line Items]
Notional Principal	$ 35,013	$ 41,970
Credit Risk Amounts	159	140
Derivatives Designated as Hedging Instruments | Interest Rate Contract
Derivative [Line Items]
Notional Principal	3,000	0
Credit Risk Amounts	44	0
Not Designated as Hedging Instrument | Foreign exchange contracts
Derivative [Line Items]
Notional Principal	16,131	13,403
Credit Risk Amounts	$ 25	$ 12