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Financing Receivables - Schedule of Financing Receivables (Details) - USD ($)
$ in Millions
Jul. 31, 2021
Jul. 25, 2020
Jul. 27, 2019
Jul. 28, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross $ 9,366 $ 10,894    
Residual value 103 123    
Unearned income (78) (114)    
Allowance for credit loss (127) (138) $ (126) $ (205)
Total, net 9,264 10,765    
Current 4,380 5,051    
Noncurrent 4,884 5,714    
Lease Receivables        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross 1,710 2,127    
Residual value 103 123    
Unearned income (78) (114)    
Allowance for credit loss (38) (48) (46) (135)
Total, net 1,697 2,088    
Current 780 918    
Noncurrent 917 1,170    
Loan Receivables        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross 5,203 5,937    
Unearned income 0 0    
Allowance for credit loss (86) (81) (71) (60)
Total, net 5,117 5,856    
Current 2,372 2,692    
Noncurrent 2,745 3,164    
Financed Service Contracts        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Gross 2,453 2,830    
Unearned income 0 0    
Allowance for credit loss (3) (9) $ (9) $ (10)
Total, net 2,450 2,821    
Current 1,228 1,441    
Noncurrent $ 1,222 $ 1,380