Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Oct. 24, 2015	Oct. 25, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 2,430	$ 1,828
Change in net unrealized gains, net of tax benefit (expense) of $56 and $14 for the three months ended October 24, 2015 and October 25, 2014, respectively	(100)	(22)
Net gains reclassified into earnings, net of tax expense of $0 and $2 for the three months ended October 24, 2015 and October 25, 2014, respectively	1	(5)
Total- Available-for-sale investments	(99)	(27)
Change in unrealized gains and losses, net of tax benefit (expense) of $2 and $3 for the three months ended October 24, 2015 and October 25, 2014, respectively	(2)	(53)
Net (gains) losses reclassified into earnings	3	4
Total- Cash flow hedging instruments	1	(49)
Net change in cumulative translation adjustment and actuarial gains and losses net of tax benefit (expense) of $(39) and $11 for the three months ended October 24, 2015 and October 25, 2014, respectively	(216)	(150)
Other comprehensive income (loss)	(314)	(226)
Comprehensive income	2,116	1,602
Comprehensive (income) loss attributable to noncontrolling interests	1	0
Comprehensive income attributable to Cisco Systems, Inc.	$ 2,117	$ 1,602