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Financial Instruments (Derivatives Designated As Fair-Value Hedges) (Details) (Interest Expense [Member], Interest Rate Swap [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jan. 27, 2013
Jan. 29, 2012
Jan. 27, 2013
Jan. 29, 2012
Interest Expense [Member] | Interest Rate Swap [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain or (Loss) Recognized in Earnings on Derivatives $ (3) $ (5) $ (7) $ (10)
Amount of Gain or (Loss) Recognized in Earnings on Hedged Items $ 3 $ 5 $ 7 $ 10