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Financing Receivables and Operating Leases (Schedule of Financing Receivables) (Details) - USD ($)
$ in Millions
Jan. 26, 2019
Oct. 27, 2018
Jul. 28, 2018
Jan. 27, 2018
Oct. 28, 2017
Jul. 29, 2017
Financing Receivables [Line Items]            
Allowance for credit loss $ (200) $ (199) $ (205) $ (272) $ (289) $ (295)
Current 5,057   4,949      
Lease Receivables            
Financing Receivables [Line Items]            
Gross 2,483   2,688      
Residual value 153   164      
Unearned income (138)   (141)      
Allowance for credit loss (127)   (135)      
Total, net 2,371   2,576      
Current 1,121   1,249      
Noncurrent 1,250   1,327      
Loan Receivables            
Financing Receivables [Line Items]            
Gross 4,926   4,999      
Residual value 0   0      
Unearned income 0   0      
Allowance for credit loss (64)   (60)      
Total, net 4,862   4,939      
Current 2,502   2,376      
Noncurrent 2,360   2,563      
Financed Service Contracts            
Financing Receivables [Line Items]            
Gross 2,398   2,326      
Residual value 0   0      
Unearned income 0   0      
Allowance for credit loss (9)   (10)      
Total, net 2,389   2,316      
Current 1,434   1,324      
Noncurrent 955   992      
Total            
Financing Receivables [Line Items]            
Gross 9,807   10,013      
Residual value 153   164      
Unearned income (138)   (141)      
Allowance for credit loss (200)   (205)      
Total, net 9,622   9,831      
Current 5,057   4,949      
Noncurrent $ 4,565   $ 4,882