Financing Receivables - Schedule of Aging Analysis of Financing Receivables (Details) - USD ($) $ in Millions	May 01, 2021	Jul. 25, 2020
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 369	$ 677
Current	9,372	10,103
Gross	9,741	10,780
120+ Still Accruing	35	67
Nonaccrual Financing Receivables	70	112
Impaired Financing Receivables	70	112
Past due 31-60 days
Financing Receivable, Past Due [Line Items]
Total Past Due	182	227
Past due 61-90 days
Financing Receivable, Past Due [Line Items]
Total Past Due	34	200
Past due 91 or above days
Financing Receivable, Past Due [Line Items]
Total Past Due	153	250
Lease Receivables
Financing Receivable, Past Due [Line Items]
Total Past Due	86	124
Current	1,556	1,889
Gross	1,642	2,013
120+ Still Accruing	13
Nonaccrual Financing Receivables	28	43
Impaired Financing Receivables	28	43
Lease Receivables | Past due 31-60 days
Financing Receivable, Past Due [Line Items]
Total Past Due	23	29
Lease Receivables | Past due 61-90 days
Financing Receivable, Past Due [Line Items]
Total Past Due	16	47
Lease Receivables | Past due 91 or above days
Financing Receivable, Past Due [Line Items]
Total Past Due	47	48
Loan Receivables
Financing Receivable, Past Due [Line Items]
Total Past Due	156	285
Current	5,482	5,652
Gross	5,638	5,937
120+ Still Accruing	8
Nonaccrual Financing Receivables	39	65
Impaired Financing Receivables	39	65
Loan Receivables | Past due 31-60 days
Financing Receivable, Past Due [Line Items]
Total Past Due	91	129
Loan Receivables | Past due 61-90 days
Financing Receivable, Past Due [Line Items]
Total Past Due	12	78
Loan Receivables | Past due 91 or above days
Financing Receivable, Past Due [Line Items]
Total Past Due	53	78
Financed Service Contracts
Financing Receivable, Past Due [Line Items]
Total Past Due	127	268
Current	2,334	2,562
Gross	2,461	2,830
120+ Still Accruing	14
Nonaccrual Financing Receivables	3	4
Impaired Financing Receivables	3	4
Financed Service Contracts | Past due 31-60 days
Financing Receivable, Past Due [Line Items]
Total Past Due	68	69
Financed Service Contracts | Past due 61-90 days
Financing Receivable, Past Due [Line Items]
Total Past Due	6	75
Financed Service Contracts | Past due 91 or above days
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 53	$ 124