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Financing Receivables And Guarantees (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended
Jan. 28, 2012
Jan. 29, 2011
Jan. 28, 2012
Jul. 30, 2011
Jan. 28, 2012
Credit Loss Allowances [Member]
Jul. 30, 2011
Credit Loss Allowances [Member]
Jan. 28, 2012
Credit Risk Ratings [Member]
Jan. 28, 2012
Channel Partner [Member]
Jan. 29, 2011
Channel Partner [Member]
Jan. 28, 2012
Channel Partner [Member]
Jan. 29, 2011
Channel Partner [Member]
Jul. 30, 2011
Channel Partner [Member]
Jan. 28, 2012
End User [Member]
Jan. 29, 2011
End User [Member]
Guarantor Obligations [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                      
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              
Financing receivable, allowance for credit loss and deferred revenue $ 2,599,000,000   $ 2,599,000,000 $ 2,793,000,000                    
Financing receivables, net of unearned income         7,388,000,000 6,966,000,000                
Risk rating for receivables deemed to be impaired, minimum     8                      
Financing receivables, 90 days past due on accrual status 80,000,000   80,000,000 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     10,700,000,000         5,400,000,000 4,500,000,000   9,000,000,000      
Balance of the channel partner financing subject to guarantees               1,600,000,000   1,600,000,000   1,400,000,000    
Financing provided by third parties for leases and loans on which the Company has provided guarantees $ 60,000,000 $ 74,000,000                     $ 95,000,000 $ 109,000,000
End-user lease and loan term maximum (years)     three