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Financing Receivables - Schedule of Financing Receivables (Details) - USD ($)
$ in Millions
Jan. 25, 2020
Oct. 26, 2019
Jul. 27, 2019
Jan. 26, 2019
Oct. 27, 2018
Jul. 28, 2018
Financing Receivables [Line Items]            
Gross $ 9,726   $ 10,174      
Residual value 133          
Residual value     142      
Unearned income (130)   (137)      
Allowance for credit loss (145) $ (133) (126) $ (200) $ (199) $ (205)
Total, net 9,584   10,053      
Current 4,827   5,095      
Noncurrent 4,757   4,958      
Lease Receivables            
Financing Receivables [Line Items]            
Gross 2,247   2,367      
Residual value 133          
Residual value     142      
Unearned income (130)   (137)      
Allowance for credit loss (42) (43) (46) (127) (131) (135)
Total, net 2,208   2,326      
Current 999   1,029      
Noncurrent 1,209   1,297      
Loan Receivables            
Financing Receivables [Line Items]            
Gross 5,297   5,438      
Unearned income 0   0      
Allowance for credit loss (95) (81) (71) (64) (60) (60)
Total, net 5,202   5,367      
Current 2,496   2,653      
Noncurrent 2,706   2,714      
Financed Service Contracts            
Financing Receivables [Line Items]            
Gross 2,182   2,369      
Unearned income 0   0      
Allowance for credit loss (8) $ (9) (9) $ (9) $ (8) $ (10)
Total, net 2,174   2,360      
Current 1,332   1,413      
Noncurrent $ 842   $ 947