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	Mar. 31, 2012	Sep. 24, 2011
Instruments qualifying as accounting hedges:
Notional Principal - Foreign exchange contracts	$ 20,505	$ 13,705
Credit Risk Amounts - Foreign exchange contracts	336	537
Instruments other than accounting hedges:
Notional Principal - Foreign exchange contracts	13,585	9,891
Credit Risk Amounts - Foreign exchange contracts	$ 43	$ 56