Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Jul. 25, 2015	Jul. 26, 2014	Jul. 27, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 8,981	$ 7,853	$ 9,983
Change in net unrealized gains, net of tax benefit (expense) of $14, $(146), and $(2) for fiscal 2015, 2014, and 2013, respectively	(12)	233	(6)
Net gains reclassified into earnings, net of tax expense (benefit) of $57, $111, and $17 for fiscal 2015, 2014, and 2013, respectively	(100)	(189)	(31)
Total- Available-for-sale investments	(112)	44	(37)
Change in unrealized gains and losses, net of tax benefit (expense) of $1, $0, and $(1) for fiscal 2015, 2014, and 2013, respectively	(158)	48	73
Net (gains) losses reclassified into earnings	154	(68)	(12)
Total- Cash flow hedging instruments	(4)	(20)	61
Net change in cumulative translation adjustment and actuarial gains and losses, net of tax benefit (expense) of $63, $(5), and $(1) for fiscal 2015, 2014, and 2013, respectively	(498)	44	(84)
Other comprehensive income (loss)	(614)	68	(60)
Comprehensive income	8,367	7,921	9,923
Comprehensive (income) loss attributable to noncontrolling interests	(2)	1	7
Comprehensive income attributable to Cisco Systems, Inc.	$ 8,365	$ 7,922	$ 9,930