Supplemental Information (Stock Repurchases Since Inception of Program) (Details) - USD ($) shares in Millions, $ in Millions	Apr. 30, 2016	Jul. 25, 2015
Supplementary Information [Line Items]
Authorized common stock repurchase amount	$ 112,000
Cumulative stock repurchased and retired (in shares)	4,563	4,443
Repurchases of common stock under the repurchase program	$ 95,797	$ 92,679
Shares of Common Stock (in shares)
Supplementary Information [Line Items]
Cumulative stock repurchased and retired (in shares)	4,563
Common Stock and Additional Paid-In Capital
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program	$ 23,651
Retained Earnings
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program	72,146
Total Cisco Shareholders’ Equity
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program	$ 95,797