Financing Receivables - Schedule of Financing Receivables Categorized by Internal Credit Risk Rating (Details) - USD ($) $ in Millions	Oct. 30, 2021	Jul. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	$ 68	$ 8
Origination year - Fiscal Year 2018/2017	329	190
Origination year - Fiscal Year 2019/2018	939	437
Origination year - Fiscal Year 2020/2019	2,146	1,413
Origination year - Fiscal Year 2021/2020	3,784	2,689
Origination year - Fiscal Year 2022/2021	1,362	4,551
Gross	8,628	9,288
Lease Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	22	3
Origination year - Fiscal Year 2018/2017	123	39
Origination year - Fiscal Year 2019/2018	284	171
Origination year - Fiscal Year 2020/2019	481	367
Origination year - Fiscal Year 2021/2020	495	590
Origination year - Fiscal Year 2022/2021	85	462
Gross	1,490	1,632
Loan Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	40	5
Origination year - Fiscal Year 2018/2017	166	107
Origination year - Fiscal Year 2019/2018	476	213
Origination year - Fiscal Year 2020/2019	1,212	829
Origination year - Fiscal Year 2021/2020	2,091	1,538
Origination year - Fiscal Year 2022/2021	824	2,511
Gross	4,809	5,203
Financed Service Contracts
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	6	0
Origination year - Fiscal Year 2018/2017	40	44
Origination year - Fiscal Year 2019/2018	179	53
Origination year - Fiscal Year 2020/2019	453	217
Origination year - Fiscal Year 2021/2020	1,198	561
Origination year - Fiscal Year 2022/2021	453	1,578
Gross	2,329	2,453
1 to 4 \| Lease Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	11	2
Origination year - Fiscal Year 2018/2017	75	20
Origination year - Fiscal Year 2019/2018	134	100
Origination year - Fiscal Year 2020/2019	204	168
Origination year - Fiscal Year 2021/2020	244	282
Origination year - Fiscal Year 2022/2021	58	227
Gross	726	799
1 to 4 \| Loan Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	27	4
Origination year - Fiscal Year 2018/2017	108	86
Origination year - Fiscal Year 2019/2018	265	134
Origination year - Fiscal Year 2020/2019	733	577
Origination year - Fiscal Year 2021/2020	1,299	990
Origination year - Fiscal Year 2022/2021	503	1,552
Gross	2,935	3,343
1 to 4 \| Financed Service Contracts
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	3	0
Origination year - Fiscal Year 2018/2017	20	38
Origination year - Fiscal Year 2019/2018	85	26
Origination year - Fiscal Year 2020/2019	189	106
Origination year - Fiscal Year 2021/2020	824	252
Origination year - Fiscal Year 2022/2021	334	1,053
Gross	1,455	1,475
5 to 6 \| Lease Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	10	1
Origination year - Fiscal Year 2018/2017	44	17
Origination year - Fiscal Year 2019/2018	141	65
Origination year - Fiscal Year 2020/2019	258	187
Origination year - Fiscal Year 2021/2020	247	285
Origination year - Fiscal Year 2022/2021	15	231
Gross	715	786
5 to 6 \| Loan Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	11	0
Origination year - Fiscal Year 2018/2017	55	19
Origination year - Fiscal Year 2019/2018	170	75
Origination year - Fiscal Year 2020/2019	439	202
Origination year - Fiscal Year 2021/2020	764	505
Origination year - Fiscal Year 2022/2021	307	925
Gross	1,746	1,726
5 to 6 \| Financed Service Contracts
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	3	0
Origination year - Fiscal Year 2018/2017	19	6
Origination year - Fiscal Year 2019/2018	90	26
Origination year - Fiscal Year 2020/2019	257	105
Origination year - Fiscal Year 2021/2020	370	302
Origination year - Fiscal Year 2022/2021	116	520
Gross	855	959
7 and Higher \| Lease Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	1	0
Origination year - Fiscal Year 2018/2017	4	2
Origination year - Fiscal Year 2019/2018	9	6
Origination year - Fiscal Year 2020/2019	19	12
Origination year - Fiscal Year 2021/2020	4	23
Origination year - Fiscal Year 2022/2021	12	4
Gross	49	47
7 and Higher \| Loan Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Origination year - Prior	2	1
Origination year - Fiscal Year 2018/2017	3	2
Origination year - Fiscal Year 2019/2018	41	4
Origination year - Fiscal Year 2020/2019	40	50
Origination year - Fiscal Year 2021/2020	28	43
Origination year - Fiscal Year 2022/2021	14	34
Gross	128	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	1	0
Origination year - Fiscal Year 2019/2018	4	1
Origination year - Fiscal Year 2020/2019	7	6
Origination year - Fiscal Year 2021/2020	4	7
Origination year - Fiscal Year 2022/2021	3	5
Gross	$ 19	$ 19

Amount of financing receivable originated more than five years prior to current fiscal year.

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Amount, before allowance for credit loss, of financing receivable.

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