Supplemental Information (Stock Repurchases Since Inception of Program) (Details) - USD ($) shares in Millions	Jul. 29, 2017	Jul. 30, 2016	Jul. 25, 2015
Supplementary Information [Line Items]
Authorized common stock repurchase amount	$ 112,000,000,000
Repurchases of common stock under the repurchase program	$ 100,303,000,000	$ 96,597,000,000	$ 92,679,000,000
Shares of Common Stock (in shares)
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program (in shares)	4,709
Common Stock and Additional Paid-In Capital
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program	$ 24,945,000,000
Retained Earnings
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program	75,358,000,000
Total Cisco Shareholders’ Equity
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program	$ 100,303,000,000