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Financing Receivables - Summary of Allowances for Credit Loss and Related Financing Receivables (Details) - USD ($)
$ in Millions
 12 Months Ended
Jul. 31, 2021
Jul. 25, 2020
Jul. 27, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for credit loss, beginning of period $ 138 $ 126 $ 205
Provisions (benefits) (27) 38 (16)
Recoveries (write-offs), net (2) (22) (42)
Foreign exchange and other 18 (4) (21)
Allowance for credit loss, end of period 127 138 126
Lease Receivables      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for credit loss, beginning of period 48 46 135
Provisions (benefits) (10) 5 (54)
Recoveries (write-offs), net (1) (3) (14)
Foreign exchange and other 1 0 (21)
Allowance for credit loss, end of period 38 48 46
Loan Receivables      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for credit loss, beginning of period 81 71 60
Provisions (benefits) (12) 32 11
Recoveries (write-offs), net (1) (19) 0
Foreign exchange and other 18 (3) 0
Allowance for credit loss, end of period 86 81 71
Financed Service Contracts      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for credit loss, beginning of period 9 9 10
Provisions (benefits) (5) 1 27
Recoveries (write-offs), net 0 0 (28)
Foreign exchange and other (1) (1) 0
Allowance for credit loss, end of period $ 3 $ 9 $ 9