Consolidated Statements of Equity - USD ($) shares in Millions, $ in Millions	Total	Total Cisco Shareholders’ Equity	Shares of Common Stock	Common Stock and Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Non-controlling Interests
Beginning balance (in shares) at Jul. 28, 2018			4,614
Beginning balance at Jul. 28, 2018	$ 43,204	$ 43,204		$ 42,820	$ 1,233	$ (849)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,549	3,549			3,549
Other comprehensive loss	(201)	(201)				(201)	0
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)	(5,026)		(1,016)	(4,010)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)			(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	43,848		41,897	3,169	(1,218)	0
Beginning balance (in shares) at Jul. 28, 2018			4,614
Beginning balance at Jul. 28, 2018	$ 43,204	43,204		42,820	1,233	(849)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)	(23)
Ending Balance (in shares) at Jul. 27, 2019			4,250
Ending balance at Jul. 27, 2019	$ 33,571	33,571		40,266	(5,903)	(792)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of adoption of accounting standards	3,729	3,729			3,897	(168)
Net income	2,926	2,926			2,926
Other comprehensive loss	(23)	(23)				(23)
Issuance of common stock (in shares)			11
Issuance of common stock	$ 2	2		2
Repurchase of common stock (in shares)	(16)		(16)
Repurchase of common stock	$ (768)	(768)		(148)	(620)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)	(5)		(4)
Shares repurchased for tax withholdings on vesting of restricted stock units	$ (194)	(194)		(194)
Cash dividends declared	(1,486)	(1,486)			(1,486)
Share-based compensation	395	395		395
Ending Balance (in shares) at Oct. 26, 2019			4,241
Ending balance at Oct. 26, 2019	$ 34,423	$ 34,423		$ 40,321	$ (5,083)	$ (815)	$ 0