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	Jun. 28, 2014	Sep. 28, 2013
Derivatives Designated as Hedging Instruments | Foreign exchange contracts
Derivative [Line Items]
Notional Principal	$ 22,996	$ 35,013
Credit Risk	132	159
Derivatives Designated as Hedging Instruments | Interest rate contracts
Derivative [Line Items]
Notional Principal	12,000	3,000
Credit Risk	121	44
Not Designated as Hedging Instrument | Foreign exchange contracts
Derivative [Line Items]
Notional Principal	21,559	16,131
Credit Risk	$ 22	$ 25