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Commitments and Contingencies - Schedule of Purchase Commitments (Details) - USD ($) $ in Millions | Jul. 31, 2021 | Jul. 25, 2020
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Commitments and Contingencies Disclosure [Abstract] |  |
Less than 1 year | $ 6,903 | $ 3,994
1 to 3 years | 1,806 | 412
3 to 5 years | 1,545 | 0
Total | $ 10,254 | $ 4,406

X
- Definition Unrecorded Unconditional Purchase Obligation, to be Paid, Year Four And Five + References No definition available. + Details
Name: | csco_UnrecordedUnconditionalPurchaseObligationToBePaidYearFourAndFive
Namespace Prefix: | csco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

X
- Definition Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + 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=123406679&loc=d3e25336-109308 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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=123406679&loc=d3e25336-109308 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant