Supplemental Information (Stock Repurchases Since Inception of Program) (Details) - USD ($) shares in Millions, $ in Millions	Jul. 25, 2015	Jul. 26, 2014	Jul. 27, 2013
Supplementary Information [Line Items]
Authorized common stock repurchase amount	$ 97,000
Cumulative Stock Repurchased and Retired Value	$ 92,679	$ 88,445	$ 78,906
Shares of Common Stock (in shares)
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program (in shares)	4,443
Common Stock and Additional Paid-In Capital
Supplementary Information [Line Items]
Cumulative Stock Repurchased and Retired Value	$ 22,615
Retained Earnings
Supplementary Information [Line Items]
Cumulative Stock Repurchased and Retired Value	70,064
Total Cisco Shareholders’ Equity
Supplementary Information [Line Items]
Cumulative Stock Repurchased and Retired Value	$ 92,679