Financing Receivables - Schedule of Financing Receivables Categorized by Internal Credit Risk Rating (Details) - USD ($) $ in Millions	May 01, 2021	Jul. 25, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	$ 25
Origination year - Fiscal Year 2017	270
Origination year - Fiscal Year 2018	732
Origination year - Fiscal Year 2019	1,750
Origination year - Fiscal Year 2020	3,090
Origination year - Fiscal Year 2021	3,874
Gross	9,741	$ 10,780
Lease Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	13
Origination year - Fiscal Year 2017	65
Origination year - Fiscal Year 2018	222
Origination year - Fiscal Year 2019	447
Origination year - Fiscal Year 2020	636
Origination year - Fiscal Year 2021	259
Gross	1,642	2,013
Loan Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	11
Origination year - Fiscal Year 2017	150
Origination year - Fiscal Year 2018	439
Origination year - Fiscal Year 2019	999
Origination year - Fiscal Year 2020	1,779
Origination year - Fiscal Year 2021	2,260
Gross	5,638	5,937
Financed Service Contracts
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	1
Origination year - Fiscal Year 2017	55
Origination year - Fiscal Year 2018	71
Origination year - Fiscal Year 2019	304
Origination year - Fiscal Year 2020	675
Origination year - Fiscal Year 2021	1,355
Gross	2,461	2,830
1 to 4
Financing Receivable, Credit Quality Indicator [Line Items]
Gross		6,445
1 to 4 | Lease Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	5
Origination year - Fiscal Year 2017	34
Origination year - Fiscal Year 2018	126
Origination year - Fiscal Year 2019	209
Origination year - Fiscal Year 2020	292
Origination year - Fiscal Year 2021	101
Gross	767	992
1 to 4 | Loan Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	7
Origination year - Fiscal Year 2017	114
Origination year - Fiscal Year 2018	321
Origination year - Fiscal Year 2019	672
Origination year - Fiscal Year 2020	1,134
Origination year - Fiscal Year 2021	1,377
Gross	3,625	3,808
1 to 4 | Financed Service Contracts
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	1
Origination year - Fiscal Year 2017	42
Origination year - Fiscal Year 2018	33
Origination year - Fiscal Year 2019	144
Origination year - Fiscal Year 2020	316
Origination year - Fiscal Year 2021	951
Gross	1,487	1,645
5 to 6
Financing Receivable, Credit Quality Indicator [Line Items]
Gross		4,066
5 to 6 | Lease Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	7
Origination year - Fiscal Year 2017	29
Origination year - Fiscal Year 2018	92
Origination year - Fiscal Year 2019	227
Origination year - Fiscal Year 2020	324
Origination year - Fiscal Year 2021	154
Gross	833	952
5 to 6 | Loan Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	3
Origination year - Fiscal Year 2017	33
Origination year - Fiscal Year 2018	112
Origination year - Fiscal Year 2019	270
Origination year - Fiscal Year 2020	596
Origination year - Fiscal Year 2021	855
Gross	1,869	1,961
5 to 6 | Financed Service Contracts
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	0
Origination year - Fiscal Year 2017	13
Origination year - Fiscal Year 2018	37
Origination year - Fiscal Year 2019	151
Origination year - Fiscal Year 2020	349
Origination year - Fiscal Year 2021	400
Gross	950	1,153
7 and Higher
Financing Receivable, Credit Quality Indicator [Line Items]
Gross		269
7 and Higher | Lease Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	1
Origination year - Fiscal Year 2017	2
Origination year - Fiscal Year 2018	4
Origination year - Fiscal Year 2019	11
Origination year - Fiscal Year 2020	20
Origination year - Fiscal Year 2021	4
Gross	42	69
7 and Higher | Loan Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	1
Origination year - Fiscal Year 2017	3
Origination year - Fiscal Year 2018	6
Origination year - Fiscal Year 2019	57
Origination year - Fiscal Year 2020	49
Origination year - Fiscal Year 2021	28
Gross	144	168
7 and Higher | Financed Service Contracts
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	0
Origination year - Fiscal Year 2017	0
Origination year - Fiscal Year 2018	1
Origination year - Fiscal Year 2019	9
Origination year - Fiscal Year 2020	10
Origination year - Fiscal Year 2021	4
Gross	$ 24	$ 32