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)	4,670			4,670		4,670
Other comprehensive income (loss)	(467)				(475)	(475)	8
Issuance of common stock (in shares)		57
Issuance of common stock	386		386			386
Repurchase of common stock (in shares)		(65)
Repurchase of common stock	$ (2,002)		(575)	(1,427)		(2,002)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)	(14)	(14)
Shares repurchased for tax withholdings on vesting of restricted stock units	$ (432)		(432)			(432)
Cash dividends declared	(2,612)			(2,612)		(2,612)
Tax effects from employee stock incentive plans	(54)		(54)			(54)
Share-based compensation	738		738			738
Purchase acquisitions and other	6		6			6
Ending Balance (in shares) at Jan. 28, 2017		5,007
Ending Balance at Jan. 28, 2017	63,818		44,585	20,027	(801)	63,811	7
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 (loss)	(6,384)			(6,384)		(6,384)
Other comprehensive income (loss)	37				37	37
Issuance of common stock (in shares)		52
Issuance of common stock	302		302			302
Repurchase of common stock (in shares)		(154)
Repurchase of common stock	$ (5,631)		(1,393)	(4,238)		(5,631)
Shares repurchased for tax withholdings on vesting of restricted stock units (in shares)	(13)	(13)
Shares repurchased for tax withholdings on vesting of restricted stock units	$ (433)		(433)			(433)
Cash dividends declared	(2,861)			(2,861)		(2,861)
Cumulative effect of adoption of accounting standard	9			9		9
Share-based compensation	785		785			785
Purchase acquisitions and other	21		21			21
Ending Balance (in shares) at Jan. 27, 2018		4,868
Ending Balance at Jan. 27, 2018	$ 51,982		$ 44,535	$ 7,364	$ 83	$ 51,982	$ 0