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Employee Benefit Plans - Summary of Share-Based Awards Available for Grant (Details) - shares shares in Millions | 12 Months Ended
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Jul. 27, 2019 | Jul. 28, 2018 | Jul. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |
Balance at beginning of fiscal year (in shares) | 245 | 272 | 242
Restricted stock, stock units, and other share-based awards granted (in shares) | (67) | (70) | (76)
Share-based awards canceled/forfeited/expired (in shares) | 18 | 18 | 78
Shares withheld for taxes and not issued (in shares) | 23 | 25 | 28
Other (in shares) | 1 | 0 | 0
Balance at end of fiscal year (in shares) | 220 | 245 | 272

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- Definition Adjustment to Share Based Awards Grants For The Period + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Reduction from available for grant share balance due to issuance of stock awards + References No definition available. + Details
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Namespace Prefix: | csco_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Shares withheld for tax and not issued + References No definition available. + Details
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Namespace Prefix: | csco_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Number of shares (or other type of equity) forfeited during the period. + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
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