Financing Receivables - Schedule of Financing Receivables Categorized by Internal Credit Risk Rating (Details) - USD ($) $ in Millions	Jan. 29, 2022	Jul. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	$ 39	$ 8
Origination year - Fiscal Year 2018/2017	233	190
Origination year - Fiscal Year 2019/2018	735	437
Origination year - Fiscal Year 2020/2019	1,804	1,413
Origination year - Fiscal Year 2021/2020	3,363	2,689
Origination year - Fiscal Year 2022/2021	1,856	4,551
Gross	8,030	9,288
Lease Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	13	3
Origination year - Fiscal Year 2018/2017	81	39
Origination year - Fiscal Year 2019/2018	215	171
Origination year - Fiscal Year 2020/2019	385	367
Origination year - Fiscal Year 2021/2020	413	590
Origination year - Fiscal Year 2022/2021	193	462
Gross	1,300	1,632
Loan Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	23	5
Origination year - Fiscal Year 2018/2017	121	107
Origination year - Fiscal Year 2019/2018	376	213
Origination year - Fiscal Year 2020/2019	1,060	829
Origination year - Fiscal Year 2021/2020	1,870	1,538
Origination year - Fiscal Year 2022/2021	1,131	2,511
Gross	4,581	5,203
Financed Service Contracts
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	3	0
Origination year - Fiscal Year 2018/2017	31	44
Origination year - Fiscal Year 2019/2018	144	53
Origination year - Fiscal Year 2020/2019	359	217
Origination year - Fiscal Year 2021/2020	1,080	561
Origination year - Fiscal Year 2022/2021	532	1,578
Gross	2,149	2,453
1 to 4 | Lease Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	6	2
Origination year - Fiscal Year 2018/2017	51	20
Origination year - Fiscal Year 2019/2018	104	100
Origination year - Fiscal Year 2020/2019	171	168
Origination year - Fiscal Year 2021/2020	209	282
Origination year - Fiscal Year 2022/2021	125	227
Gross	666	799
1 to 4 | Loan Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	16	4
Origination year - Fiscal Year 2018/2017	85	86
Origination year - Fiscal Year 2019/2018	221	134
Origination year - Fiscal Year 2020/2019	665	577
Origination year - Fiscal Year 2021/2020	1,182	990
Origination year - Fiscal Year 2022/2021	660	1,552
Gross	2,829	3,343
1 to 4 | Financed Service Contracts
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	2	0
Origination year - Fiscal Year 2018/2017	16	38
Origination year - Fiscal Year 2019/2018	65	26
Origination year - Fiscal Year 2020/2019	169	106
Origination year - Fiscal Year 2021/2020	740	252
Origination year - Fiscal Year 2022/2021	380	1,053
Gross	1,372	1,475
5 to 6 | Lease Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	6	1
Origination year - Fiscal Year 2018/2017	28	17
Origination year - Fiscal Year 2019/2018	105	65
Origination year - Fiscal Year 2020/2019	199	187
Origination year - Fiscal Year 2021/2020	200	285
Origination year - Fiscal Year 2022/2021	57	231
Gross	595	786
5 to 6 | Loan Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	5	0
Origination year - Fiscal Year 2018/2017	34	19
Origination year - Fiscal Year 2019/2018	119	75
Origination year - Fiscal Year 2020/2019	359	202
Origination year - Fiscal Year 2021/2020	662	505
Origination year - Fiscal Year 2022/2021	450	925
Gross	1,629	1,726
5 to 6 | Financed Service Contracts
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	1	0
Origination year - Fiscal Year 2018/2017	15	6
Origination year - Fiscal Year 2019/2018	76	26
Origination year - Fiscal Year 2020/2019	184	105
Origination year - Fiscal Year 2021/2020	337	302
Origination year - Fiscal Year 2022/2021	149	520
Gross	762	959
7 and Higher | Lease Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	1	0
Origination year - Fiscal Year 2018/2017	2	2
Origination year - Fiscal Year 2019/2018	6	6
Origination year - Fiscal Year 2020/2019	15	12
Origination year - Fiscal Year 2021/2020	4	23
Origination year - Fiscal Year 2022/2021	11	4
Gross	39	47
7 and Higher | Loan Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	2	1
Origination year - Fiscal Year 2018/2017	2	2
Origination year - Fiscal Year 2019/2018	36	4
Origination year - Fiscal Year 2020/2019	36	50
Origination year - Fiscal Year 2021/2020	26	43
Origination year - Fiscal Year 2022/2021	21	34
Gross	123	134
7 and Higher | Financed Service Contracts
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	0	0
Origination year - Fiscal Year 2018/2017	0	0
Origination year - Fiscal Year 2019/2018	3	1
Origination year - Fiscal Year 2020/2019	6	6
Origination year - Fiscal Year 2021/2020	3	7
Origination year - Fiscal Year 2022/2021	3	5
Gross	$ 15	$ 19