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Leases - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2021	Jul. 25, 2020
Leases [Abstract]
Weighted-average remaining lease term (in years)	5 years 2 months 12 days	4 years
Weighted-average discount rate	1.70%	1.50%
Sales-type lease term, on average	4 years
Interest income, lease receivables	$ 75	$ 94
Operating lease income	$ 151	$ 190

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- References

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- Definition

Term of lessor's sales-type lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
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- Definition

Amount of operating lease income from lease payments and variable lease payments paid and payable to lessor. Includes, but is not limited to, variable lease payments not included in measurement of lease receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Weighted average discount rate for operating lease calculated at point in time.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of interest income from lease receivable of sales-type lease.

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-Publisher FASB
-Name Accounting Standards Codification
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