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
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 (loss)	7,185			7,185		7,185
Other comprehensive income (loss)	(15)				(16)	(16)	1
Issuance of common stock (in shares)		65
Issuance of common stock	418		418			418
Repurchase of common stock (in shares)		(80)
Repurchase of common stock	$ (2,505)		(708)	(1,797)		(2,505)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)	(16)	(16)
Shares repurchased for tax withholdings on vesting of restricted stock units	$ (497)		(497)			(497)
Cash dividends declared	(4,063)			(4,063)		(4,063)
Tax effects from employee stock incentive plans	(34)		(34)			(34)
Share-based compensation	1,138		1,138			1,138
Purchase acquisitions and other	170		170			170
Ending Balance (in shares) at Apr. 29, 2017		4,998
Ending Balance at Apr. 29, 2017	$ 65,382		45,003	20,721	(342)	65,382	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of common stock (in shares)	(38)
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]
Effect of adoption of accounting standards	9			(36)	45	9
Net income (loss)	(3,693)			(3,693)		(3,693)
Other comprehensive income (loss)	(695)				(695)	(695)
Issuance of common stock (in shares)		61
Issuance of common stock	318		318			318
Repurchase of common stock (in shares)		(294)
Repurchase of common stock	$ (11,646)		(2,679)	(8,967)		(11,646)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)	(16)	(16)
Shares repurchased for tax withholdings on vesting of restricted stock units	$ (541)		(541)			(541)
Cash dividends declared	(4,433)			(4,433)		(4,433)
Share-based compensation	1,184		1,184			1,184
Purchase acquisitions and other	21		21			21
Ending Balance (in shares) at Apr. 28, 2018		4,734
Ending Balance at Apr. 28, 2018	$ 46,661		$ 43,556	$ 3,709	$ (604)	$ 46,661	$ 0