Supplemental Information (Stock Repurchases Since Inception of Program) (Details) - USD ($) shares in Millions, $ in Millions	Jul. 30, 2016	Jul. 25, 2015	Jul. 26, 2014
Supplementary Information [Line Items]
Authorized common stock repurchase amount	$ 112,000
Repurchases of common stock under the repurchase program	$ 96,597	$ 92,679	$ 88,445
Shares of Common Stock (in shares)
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program (in shares)	4,591
Common Stock and Additional Paid-In Capital
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program	$ 23,895
Retained Earnings
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program	72,702
Total Cisco Shareholders’ Equity
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program	$ 96,597