Financing Receivables - Schedule of Aging Analysis of Financing Receivables (Details) - USD ($) $ in Millions	Jan. 29, 2022	Jul. 31, 2021
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	$ 8,030	$ 9,288
120+ Still Accruing	21	8
Nonaccrual Financing Receivables	46	69
Impaired Financing Receivables	46	62
Total Past Due
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	219	239
Past due 31-60 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	108	110
Past due 61-90 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	33	47
Past due 91 or above days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	78	82
Current
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	7,811	9,049
Lease Receivables
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	1,300	1,632
120+ Still Accruing	9	1
Nonaccrual Financing Receivables	19	33
Impaired Financing Receivables	19	26
Lease Receivables | Total Past Due
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	67	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	15	17
Lease Receivables | Past due 91 or above days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	26	29
Lease Receivables | Current
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	1,233	1,565
Loan Receivables
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	4,581	5,203
120+ Still Accruing	8	4
Nonaccrual Financing Receivables	25	33
Impaired Financing Receivables	25	33
Loan Receivables | Total Past Due
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	120	123
Loan Receivables | Past due 31-60 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	66	71
Loan Receivables | Past due 61-90 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	12	17
Loan Receivables | Past due 91 or above days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	42	35
Loan Receivables | Current
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	4,461	5,080
Financed Service Contracts
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	2,149	2,453
120+ Still Accruing	4	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	32	49
Financed Service Contracts | Past due 31-60 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	16	18
Financed Service Contracts | Past due 61-90 days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	6	13
Financed Service Contracts | Past due 91 or above days
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	10	18
Financed Service Contracts | Current
Financing Receivable, Past Due [Line Items]
Gross Financing Receivables	$ 2,117	$ 2,404