Financing Receivables - Schedule of Aging Analysis of Financing Receivables (Details) - USD ($) $ in Millions	Apr. 30, 2022	Jul. 31, 2021
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	$ 7,805	$ 9,288
120+ Still Accruing	18	8
Nonaccrual Financing Receivables	69	69
Impaired Financing Receivables	69	62
Total Past Due
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	294	239
Past due 31-60 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	158	110
Past due 61-90 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	64	47
Past due 91 or above days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	72	82
Current
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	7,511	9,049
Lease Receivables
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	1,245	1,632
120+ Still Accruing	7	1
Nonaccrual Financing Receivables	14	33
Impaired Financing Receivables	14	26
Lease Receivables | Total Past Due
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	60	67
Lease Receivables | Past due 31-60 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	26	21
Lease Receivables | Past due 61-90 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	10	17
Lease Receivables | Past due 91 or above days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	24	29
Lease Receivables | Current
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	1,185	1,565
Loan Receivables
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	4,509	5,203
120+ Still Accruing	6	4
Nonaccrual Financing Receivables	53	33
Impaired Financing Receivables	53	33
Loan Receivables | Total Past Due
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	150	123
Loan Receivables | Past due 31-60 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	87	71
Loan Receivables | Past due 61-90 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	38	17
Loan Receivables | Past due 91 or above days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	25	35
Loan Receivables | Current
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	4,359	5,080
Financed Service Contracts
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	2,051	2,453
120+ Still Accruing	5	3
Nonaccrual Financing Receivables	2	3
Impaired Financing Receivables	2	3
Financed Service Contracts | Total Past Due
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	84	49
Financed Service Contracts | Past due 31-60 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	45	18
Financed Service Contracts | Past due 61-90 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	16	13
Financed Service Contracts | Past due 91 or above days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	23	18
Financed Service Contracts | Current
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	$ 1,967	$ 2,404