Consolidated Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 26, 2013	Oct. 27, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 1,996	$ 2,092
Change in net unrealized gains, net of tax benefit (expense) of $(53) and $1 for the three months ended October 26, 2013 and October 27, 2012, respectively	121	4
Net gains reclassified into earnings, net of tax expense of $31 and $10 for the three months ended October 26, 2013 and October 27, 2012, respectively	(52)	(17)
Total available-for-sale investments	69	(13)
Change in unrealized gains and losses, net of tax expense of $3 and $0 for the three months ended October 26, 2013 and October 27, 2012, respectively	35	66
Net (gains) losses reclassified into earnings	(9)	5
Total cash flow hedging instruments	26	71
Net change in cumulative translation adjustment and other, net of tax expense of $3 and $10 for the three months ended October 26, 2013 and October 27, 2012, respectively	73	114
Other comprehensive income	168	172
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	2,164	2,264
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest	(4)	0
Comprehensive income attributable to Cisco Systems, Inc.	$ 2,160	$ 2,264