Financing Receivables - Summary of Allowances for Credit Loss and Related Financing Receivables (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 01, 2021	Apr. 25, 2020	May 01, 2021	Apr. 25, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss as of beginning of period	$ 148	$ 145	$ 138	$ 126
Provisions (benefits)	(10)	(11)	(19)	27
Recoveries (write-offs), net	(2)	(2)	(2)	(20)
Foreign exchange and other	0	(4)	19	(5)
Allowance for credit loss as of end of period	136	128	136	128
Lease Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss as of beginning of period	43	42	48	46
Provisions (benefits)	(2)	(4)	(9)	(8)
Recoveries (write-offs), net	(1)	(1)	(1)	(2)
Foreign exchange and other	0	(1)	2	0
Allowance for credit loss as of end of period	40	36	40	36
Loan Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss as of beginning of period	96	95	81	71
Provisions (benefits)	(4)	(5)	(7)	37
Recoveries (write-offs), net	(1)	(1)	(1)	(18)
Foreign exchange and other	0	(3)	18	(4)
Allowance for credit loss as of end of period	91	86	91	86
Financed Service Contracts
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss as of beginning of period	9	8	9	9
Provisions (benefits)	(4)	(2)	(3)	(2)
Recoveries (write-offs), net	0	0	0	0
Foreign exchange and other	0	0	(1)	(1)
Allowance for credit loss as of end of period	$ 5	$ 6	$ 5	$ 6