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Leases - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 30, 2021	Oct. 24, 2020	Jul. 31, 2021
Leases [Abstract]
Weighted-average remaining lease term (in years)	4 years 10 months 24 days		5 years 2 months 12 days
Weighted-average discount rate	1.70%		1.70%
Sales-type lease terms, on average	4 years
Interest income, lease receivables	$ 15	$ 21
Operating lease income	$ 32	$ 43

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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

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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.

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Weighted average discount rate for operating lease calculated at point in time.

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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
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Amount of interest income from lease receivable of sales-type lease.

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