Supplemental Information (Stock Repurchases Since Inception of Program) (Details) - USD ($)	Oct. 28, 2017	Jul. 29, 2017
Supplementary Information [Line Items]
Authorized common stock repurchase amount	$ 112,000,000,000
Repurchases of common stock under the repurchase program (in shares)	4,760,000,000	4,709,000,000
Repurchases of common stock under the repurchase program	$ 101,923,000,000	$ 100,303,000,000
Shares of Common Stock
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program (in shares)	4,760,000,000
Common Stock and Additional Paid-In Capital
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program	$ 25,407,000,000
Retained Earnings
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program	76,516,000,000
Total Cisco Shareholders’ Equity
Supplementary Information [Line Items]
Repurchases of common stock under the repurchase program	$ 101,923,000,000