Consolidated Statements of Equity - USD ($) shares in Millions, $ in Millions	Total	Shares of Common Stock	Common Stock and Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Total Cisco Shareholders’ Equity	Non-controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of adoption of accounting standards	$ 9			$ 9		$ 9
Beginning balance (in shares) at Jul. 29, 2017		4,983
Beginning balance at Jul. 29, 2017	66,137		$ 45,253	20,838	$ 46	66,137	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,394			2,394		2,394
Other comprehensive income (loss)	(15)				(15)	(15)	0
Issuance of common stock (in shares)		30
Issuance of common stock	$ 9		9			9
Repurchase of common stock (in shares)	(51)	(51)
Repurchase of common stock	$ (1,620)		(462)	(1,158)		(1,620)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)	(11)	(11)
Shares repurchased for tax withholdings on vesting of restricted stock units	$ (342)		(342)			(342)
Cash dividends declared	(1,436)			(1,436)		(1,436)
Share-based compensation	392		392			392
Purchase acquisitions and other	22		22			22
Ending Balance (in shares) at Oct. 28, 2017		4,951
Ending Balance at Oct. 28, 2017	65,550		44,872	20,647	31	65,550	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of adoption of accounting standards	3,729			3,897	(168)	3,729
Beginning balance (in shares) at Jul. 28, 2018		4,614
Beginning balance at Jul. 28, 2018	43,204		42,820	1,233	(849)	43,204	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,549			3,549		3,549
Other comprehensive income (loss)	(201)				(201)	(201)
Issuance of common stock (in shares)		19
Issuance of common stock	$ 8		8			8
Repurchase of common stock (in shares)	(109)	(109)
Repurchase of common stock	$ (5,026)		(1,016)	(4,010)		(5,026)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)	(7)	(7)
Shares repurchased for tax withholdings on vesting of restricted stock units	$ (318)		(318)			(318)
Cash dividends declared	(1,500)			(1,500)		(1,500)
Share-based compensation	403		403			403
Ending Balance (in shares) at Oct. 27, 2018		4,517
Ending Balance at Oct. 27, 2018	$ 43,848		$ 41,897	$ 3,169	$ (1,218)	$ 43,848	$ 0