Financing Receivables - Summary of Allowances for Credit Loss and Related Financing Receivables (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2022	May 01, 2021	Apr. 30, 2022	May 01, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss, beginning of period	$ 97	$ 148	$ 127	$ 138
Provisions (benefits)	24	(10)	(4)	(19)
Recoveries (write-offs), net		(2)	(2)	(2)
Other	3		3	19
Allowance for credit loss, end of period	124	136	124	136
Lease Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss, beginning of period	27	43	38	48
Provisions (benefits)	(2)	(2)	(11)	(9)
Recoveries (write-offs), net		(1)	(2)	(1)
Other	0		0	2
Allowance for credit loss, end of period	25	40	25	40
Loan Receivables
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss, beginning of period	67	96	86	81
Provisions (benefits)	27	(4)	8	(7)
Recoveries (write-offs), net		(1)	0	(1)
Other	3		3	18
Allowance for credit loss, end of period	97	91	97	91
Financed Service Contracts
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss, beginning of period	3	9	3	9
Provisions (benefits)	(1)	(4)	(1)	(3)
Recoveries (write-offs), net		0	0	0
Other	0		0	(1)
Allowance for credit loss, end of period	$ 2	$ 5	$ 2	$ 5