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Financing Receivables and Operating Leases (Schedule Of Financing Receivables) (Details) - USD ($)
$ in Millions
Jan. 28, 2017
Oct. 29, 2016
Jul. 30, 2016
Jan. 23, 2016
Oct. 24, 2015
Jul. 25, 2015
Financing Receivables [Line Items]            
Allowance for credit loss $ (378) $ (386) $ (375) $ (365) $ (378) $ (382)
Current 4,496   4,272      
Lease Receivables            
Financing Receivables [Line Items]            
Gross 2,967   3,272      
Residual value 191   202      
Unearned income (154)   (174)      
Allowance for credit loss (225)   (230)      
Total, net 2,779   3,070      
Current 1,419   1,490      
Noncurrent 1,360   1,580      
Loan Receivables            
Financing Receivables [Line Items]            
Gross 2,369   2,135      
Residual value 0   0      
Unearned income 0   0      
Allowance for credit loss (106)   (97)      
Total, net 2,263   2,038      
Current 1,040   988      
Noncurrent 1,223   1,050      
Financed Service Contracts and Other            
Financing Receivables [Line Items]            
Gross 4,165   3,370      
Residual value 0   0      
Unearned income 0   0      
Allowance for credit loss (47)   (48)      
Total, net 4,118   3,322      
Current 2,037   1,794      
Noncurrent 2,081   1,528      
Total            
Financing Receivables [Line Items]            
Gross 9,501   8,777      
Residual value 191   202      
Unearned income (154)   (174)      
Allowance for credit loss (378)   (375)      
Total, net 9,160   8,430      
Current 4,496   4,272      
Noncurrent $ 4,664   $ 4,158