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 Deficit)	Accumulated Other Comprehensive Income (Loss)	Total Cisco Shareholders’ Equity	Non-controlling Interests
Beginning balance (in shares) at Jul. 30, 2016		5,029
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	9,609			9,609		9,609
Other comprehensive income (loss)	373				372	372	1
Issuance of common stock (in shares)		92
Issuance of common stock	$ 708		708			708
Repurchase of common stock (in shares)	(118)	(118)
Repurchase of common stock	$ (3,706)		(1,050)	(2,656)		(3,706)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)		(20)
Shares repurchased for tax withholdings on vesting of restricted stock units	(619)		(619)			(619)
Cash dividends declared	(5,511)			(5,511)		(5,511)
Tax effects from employee stock incentive plans	(10)		(10)			(10)
Share-based compensation	1,540		1,540			1,540
Purchase acquisitions and other	168		168			168
Ending Balance (in shares) at Jul. 29, 2017		4,983
Ending Balance at Jul. 29, 2017	66,137		45,253	20,838	46	66,137	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	110			110		110
Other comprehensive income (loss)	(940)				(940)	(940)
Issuance of common stock (in shares)		83
Issuance of common stock	$ 623		623			623
Repurchase of common stock (in shares)	(432)	(432)
Repurchase of common stock	$ (17,661)		(3,950)	(13,711)		(17,661)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)		(20)
Shares repurchased for tax withholdings on vesting of restricted stock units	(703)		(703)			(703)
Cash dividends declared	(5,968)			(5,968)		(5,968)
Share-based compensation	1,576		1,576			1,576
Purchase acquisitions and other	21		21			21
Ending Balance (in shares) at Jul. 28, 2018		4,614
Ending Balance at Jul. 28, 2018	43,204		42,820	1,233	(849)	43,204	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of adoption of accounting standards	9			(36)	45	9
Net income	11,621			11,621		11,621
Other comprehensive income (loss)	225				225	225
Issuance of common stock (in shares)		71
Issuance of common stock	$ 640		640			640
Repurchase of common stock (in shares)	(418)	(418)
Repurchase of common stock	$ (20,577)		(3,902)	(16,675)		(20,577)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)		(17)
Shares repurchased for tax withholdings on vesting of restricted stock units	(862)		(862)			(862)
Cash dividends declared	(5,979)			(5,979)		(5,979)
Share-based compensation	1,570		1,570			1,570
Ending Balance (in shares) at Jul. 27, 2019		4,250
Ending Balance at Jul. 27, 2019	33,571		$ 40,266	(5,903)	(792)	33,571	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of adoption of accounting standards	$ 3,729			$ 3,897	$ (168)	$ 3,729