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Financing Receivables - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2021	Jul. 25, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Average lease term	4 years
Loan receivables term	3 years
Financing receivable, threshold period past due	31 days
Financing receivable, 120 days plus past due but on accrual status	$ 8	$ 67
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financed service contracts term	1 year
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan receivables term	3 years
Financed service contracts term	3 years

X

- Definition

Financing Receivable, 120 Days or More Past Due, Still Accruing

+ References

No definition available.

+ Details

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Namespace Prefix:	csco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Service Agreement Term

+ References

No definition available.

+ Details

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Namespace Prefix:	csco_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term of loan receivable arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	csco_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Threshold period for when financing receivable is considered past due, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes threshold period past due to write off as uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919253-210447

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981

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Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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