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Financing Receivables and Operating Leases (Schedule Of Financing Receivables) (Details) - USD ($)
$ in Millions
Apr. 30, 2016
Jan. 23, 2016
Jul. 25, 2015
Apr. 25, 2015
Jan. 24, 2015
Jul. 26, 2014
Financing Receivables [Line Items]            
Allowance for credit loss $ (383) $ (365) $ (382) $ (359) $ (375) $ (349)
Current 4,716   4,491      
Deferred revenue: 15,272   15,183      
Lease Receivables            
Financing Receivables [Line Items]            
Gross 3,245   3,361      
Residual value 205   224      
Unearned income (178)   (190)      
Allowance for credit loss (250)   (259)      
Current 1,495   1,468      
Noncurrent 1,527   1,668      
Total, net 3,022   3,136      
Loan Receivables            
Financing Receivables [Line Items]            
Gross 2,223   1,763      
Residual value 0   0      
Unearned income 0   0      
Allowance for credit loss (93)   (87)      
Current 1,052   856      
Noncurrent 1,078   820      
Total, net 2,130   1,676      
Financed Service Contracts and Other            
Financing Receivables [Line Items]            
Gross 3,504   3,573      
Residual value 0   0      
Unearned income 0   0      
Allowance for credit loss (40)   (36)      
Current 2,169   2,167      
Noncurrent 1,295   1,370      
Total, net 3,464   3,537      
Total            
Financing Receivables [Line Items]            
Gross 8,972   8,697      
Residual value 205   224      
Unearned income (178)   (190)      
Allowance for credit loss (383)   (382)      
Current 4,716   4,491      
Noncurrent 3,900   3,858      
Total, net $ 8,616   $ 8,349