Financing Receivables - Schedule of Aging Analysis of Financing Receivables (Details) - USD ($) $ in Millions	Oct. 30, 2021	Jul. 31, 2021
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	$ 8,628	$ 9,288
120+ Still Accruing	18	8
Nonaccrual Financing Receivables	56	69
Impaired Financing Receivables	56	62
Total Past Due
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	267	239
Past due 31-60 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	132	110
Past due 61-90 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	68	47
Past due 91 or above days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	67	82
Current
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	8,361	9,049
Lease Receivables
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	1,490	1,632
120+ Still Accruing	8	1
Nonaccrual Financing Receivables	24	33
Impaired Financing Receivables	24	26
Lease Receivables | Total Past Due
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	68	67
Lease Receivables | Past due 31-60 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	34	21
Lease Receivables | Past due 61-90 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	12	17
Lease Receivables | Past due 91 or above days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	22	29
Lease Receivables | Current
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	1,422	1,565
Loan Receivables
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	4,809	5,203
120+ Still Accruing	6	4
Nonaccrual Financing Receivables	29	33
Impaired Financing Receivables	29	33
Loan Receivables | Total Past Due
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	121	123
Loan Receivables | Past due 31-60 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	77	71
Loan Receivables | Past due 61-90 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	17	17
Loan Receivables | Past due 91 or above days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	27	35
Loan Receivables | Current
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	4,688	5,080
Financed Service Contracts
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	2,329	2,453
120+ Still Accruing	4	3
Nonaccrual Financing Receivables	3	3
Impaired Financing Receivables	3	3
Financed Service Contracts | Total Past Due
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	78	49
Financed Service Contracts | Past due 31-60 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	21	18
Financed Service Contracts | Past due 61-90 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	39	13
Financed Service Contracts | Past due 91 or above days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	18	18
Financed Service Contracts | Current
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	$ 2,251	$ 2,404