Investments - Additional Information (Detail) (USD $) In Billions, unless otherwise specified	3 Months Ended
Oct. 27, 2012	Oct. 29, 2011
Disclosure Investments Additional Information [Abstract]
Average Balance Of Securities Lending	$ 0.8	$ 0.6
Fair Value Of Securities Received As Collateral That Can Be Resold Or RePledged Percentage	102.00%

Fair value of securities received as collateral that can be resold or repledged percentage.

No definition available.

Name:	csco_FairValueOfSecuritiesReceivedAsCollateralThatCanBeResoldOrRepledgedPercentage
Namespace Prefix:	csco_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration