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Derivative Instruments (Schedule Of Notional Amounts Of Derivatives Outstanding) (Details) (USD $)
In Millions, unless otherwise specified
Jan. 26, 2013
Jul. 28, 2012
Notional Amount of Derivatives [Abstract]    
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives $ 1,646 $ 2,910
Notional amount of interest rate derivatives 4,250 4,250
Notional Amount of Derivative Instruments Designated as Net Investment Hedges 325 468
Notional Amount of Price Risk Fair Value Hedge Derivatives 629 272
Notional Amount of Foreign Currency Derivative Instruments Not Designated as Hedging Instruments 4,231 6,241
Notional Amount Of Total Return Swaps Deferred Compensation Derivative Instruments Not Designated As Hedging Instruments 324 269
Notional amounts of derivatives outstanding $ 11,405 $ 14,410