Consolidated Statements Of Equity - USD ($) $ 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
Beginning balance (in shares) at Jul. 30, 2016		5,029,000,000
Beginning balance at Jul. 30, 2016	$ 63,585		$ 44,516	$ 19,396	$ (326)	$ 63,586	$ (1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,322			2,322		2,322
Other comprehensive income (loss)	(190)				(198)	(198)	8
Issuance of common stock (in shares)		40,000,000
Issuance of common stock	88		88			88
Repurchase of common stock (in shares)		(32,000,000)
Repurchase of common stock	$ (1,001)		(285)	(716)		(1,001)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)	(13,000,000)	(13,000,000)
Shares repurchased for tax withholdings on vesting of restricted stock units	$ (401)		(401)			(401)
Cash dividends declared	(1,308)			(1,308)		(1,308)
Tax effects from employee stock incentive plans	(60)		(60)			(60)
Share-based compensation	372		372			372
Purchase acquisitions and other	6		6			6
Ending Balance (in shares) at Oct. 29, 2016		5,024,000,000
Ending Balance at Oct. 29, 2016	63,413		44,236	19,694	(524)	63,406	7
Beginning balance (in shares) at Jul. 29, 2017		4,983,000,000
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)
Issuance of common stock (in shares)		30,000,000
Issuance of common stock	$ 9		9			9
Repurchase of common stock (in shares)	(51,000,000)	(51,000,000)
Repurchase of common stock	$ (1,620)		(462)	(1,158)		(1,620)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)	(11,000,000)	(11,000,000)
Shares repurchased for tax withholdings on vesting of restricted stock units	$ (342)		(342)			(342)
Cash dividends declared	(1,436)			(1,436)		(1,436)
Cumulative effect of adoption of accounting standard	9			9		9
Share-based compensation	392		392			392
Purchase acquisitions and other	22		22			22
Ending Balance (in shares) at Oct. 28, 2017		4,951,000,000
Ending Balance at Oct. 28, 2017	$ 65,550		$ 44,872	$ 20,647	$ 31	$ 65,550	$ 0