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Financing Receivables and Operating Leases (Summary of Allowances for Credit Loss and Related Financing Receivables) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 26, 2019
Jan. 27, 2018
Jan. 26, 2019
Jan. 27, 2018
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Allowance for credit loss as of beginning of period $ 199 $ 289 $ 205 $ 295
Provisions (benefits) 1 (20) (4) (26)
Foreign exchange and other   3 (1) 3
Allowance for credit loss as of end of period 200 272 200 272
Lease Receivables        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Allowance for credit loss as of beginning of period 131 160 135 162
Provisions (benefits) (4) 3 (7) 1
Foreign exchange and other   2 (1) 2
Allowance for credit loss as of end of period 127 165 127 165
Loan Receivables        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Allowance for credit loss as of beginning of period 60 106 60 103
Provisions (benefits) 4 (13) 4 (11)
Foreign exchange and other   1 0 2
Allowance for credit loss as of end of period 64 94 64 94
Financed Service Contracts        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Allowance for credit loss as of beginning of period 8 23 10 30
Provisions (benefits) 1 (10) (1) (16)
Foreign exchange and other   0 0 (1)
Allowance for credit loss as of end of period 9 $ 13 9 $ 13
Lease Receivables        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Allowance for credit loss as of beginning of period     135  
Allowance for credit loss as of end of period 127   127  
Loan Receivables        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Allowance for credit loss as of beginning of period     60  
Allowance for credit loss as of end of period 64   64  
Financed Service Contracts        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Allowance for credit loss as of beginning of period     10  
Allowance for credit loss as of end of period $ 9   $ 9