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Financing Receivables and Operating Leases (Schedule of Financing Receivables) (Details) - USD ($)
$ in Millions
Jan. 27, 2018
Oct. 28, 2017
Jul. 29, 2017
Jan. 28, 2017
Oct. 29, 2016
Jul. 30, 2016
Financing Receivables [Line Items]            
Allowance for credit loss $ (272) $ (289) $ (295) $ (378) $ (386) $ (375)
Current 4,925   4,856      
Lease Receivables            
Financing Receivables [Line Items]            
Gross 2,762   2,784      
Residual value 168   173      
Unearned income (145)   (145)      
Allowance for credit loss (165)   (162)      
Total, net 2,620   2,650      
Current 1,222   1,301      
Noncurrent 1,398   1,349      
Loan Receivables            
Financing Receivables [Line Items]            
Gross 4,846   4,560      
Residual value 0   0      
Unearned income 0   0      
Allowance for credit loss (94)   (103)      
Total, net 4,752   4,457      
Current 2,258   2,104      
Noncurrent 2,494   2,353      
Financed Service Contracts            
Financing Receivables [Line Items]            
Gross 2,479   2,517      
Residual value 0   0      
Unearned income 0   0      
Allowance for credit loss (13)   (30)      
Total, net 2,466   2,487      
Current 1,445   1,451      
Noncurrent 1,021   1,036      
Total            
Financing Receivables [Line Items]            
Gross 10,087   9,861      
Residual value 168   173      
Unearned income (145)   (145)      
Allowance for credit loss (272)   (295)      
Total, net 9,838   9,594      
Current 4,925   4,856      
Noncurrent $ 4,913   $ 4,738