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Commitments and Contingencies - Schedule of Purchase Commitments (Details) - USD ($) $ in Millions	Jul. 31, 2021	Jul. 25, 2020
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

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary
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

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant