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Financing Receivables and Guarantees - Additional Information (Detail) (USD $)
 12 Months Ended
Jul. 28, 2012
Year
Jul. 30, 2011
Jul. 31, 2010
Financing Receivables And Guarantees [Line Items]      
Average term of lease arrangements, years 4    
Average term of loan arrangements, years 3    
Revenue recognition range, low end, in years 1    
Revenue recognition range, high end, in years 3    
Deferred service revenue associated with financed service contracts and other $ 1,838,000,000 $ 2,044,000,000  
Financing receivables, 91 days past due on accrual status 109,000,000 50,000,000  
Channel partners revolving short-term financing payment term, minimum (days) 60    
Channel partners revolving short-term financing payment term, maximum (days) 90    
Volume of channel partner financing 21,300,000,000 18,200,000,000 17,200,000,000
Balance of the channel partner financing subject to guarantees 1,200,000,000 1,400,000,000  
End-user lease and loan term maximum (years) Three    
Financing provided by third parties for leases and loans on which the Company has provided guarantees 227,000,000 247,000,000 180,000,000
Lease Receivables
      
Financing Receivables And Guarantees [Line Items]      
Amounts greater than 91 days past due 139,000,000 116,000,000  
Loan Receivables
      
Financing Receivables And Guarantees [Line Items]      
Amounts greater than 91 days past due 3,000,000 15,000,000  
Financed Service Contracts & Other
      
Financing Receivables And Guarantees [Line Items]      
Amounts greater than 91 days past due 313,000,000 230,000,000  
Credit Loss Allowances
      
Financing Receivables And Guarantees [Line Items]      
Financing receivable, allowance for credit loss and deferred revenue 2,387,000,000 2,793,000,000  
Financing receivables, net of unearned income $ 7,626,000,000 $ 6,966,000,000  
Credit Risk Ratings
      
Financing Receivables And Guarantees [Line Items]      
Financing credit risk rating-investment-lowest 1    
Financing credit risk rating-investment-highest 4    
Financing credit risk rating-non investment-lowest 5    
Financing credit risk rating-non investment-highest 6    
Financing credit risk rating-substandard 7