Supplemental Information (Stock Repurchases Since Inception of Program) (Details) - USD ($) shares in Millions	Jan. 28, 2017	Jul. 30, 2016
Supplementary Information [Line Items]
Authorized common stock repurchase amount	$ 112,000,000,000
Repurchases of common stock under the repurchase program (in shares)	4,656	4,591
Repurchases of common stock under the repurchase program	$ 98,599,000,000	$ 96,597,000,000
Shares of Common Stock
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program (in shares)	4,656
Common Stock and Additional Paid-In Capital
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program	$ 24,470,000,000
Retained Earnings
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program	74,129,000,000
Total Cisco Shareholders’ Equity
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program	$ 98,599,000,000