Balance Sheet and Other Details - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
May 01, 2021	Apr. 25, 2020	Jul. 25, 2020
Disaggregation of Revenue [Line Items]
Provision for inventory	$ 91	$ 49
Deferred revenue	20,889		$ 20,446
Remaining performance obligation	28,138		28,354
Unbilled Contract Revenue
Disaggregation of Revenue [Line Items]
Remaining performance obligation	$ 7,200		$ 7,900

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 606
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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