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Commitments and Contingencies - Schedule of Purchase Commitments (Details) - USD ($) $ in Millions | May 01, 2021 | Jul. 25, 2020
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Commitments and Contingencies Disclosure [Abstract] |  |
Less than 1 year | $ 6,461 | $ 3,994
1 to 3 years | 1,615 | 412
3 to 5 years | 1,733 | 0
Total | $ 9,809 | $ 4,406

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- Definition Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four And Five + References No definition available. + Details
Name: | csco_UnrecordedUnconditionalPurchaseObligationDueInRollingYearFourAndFive
Namespace Prefix: | csco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two And Three + References No definition available. + Details
Name: | csco_UnrecordedUnconditionalPurchaseObligationDueInRollingYearTwoAndThree
Namespace Prefix: | csco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121559207&loc=d3e25336-109308 + Details
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
Name: | us-gaap_UnrecordedUnconditionalPurchaseObligationDueInNextRollingTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant