Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Oct. 25, 2014	Oct. 26, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 1,828	$ 1,996
Change in net unrealized gains, net of tax benefit (expense) of $14 and $(53) for the three months ended October 25, 2014 and October 26, 2013, respectively	(22)	121
Net gains reclassified into earnings, net of tax expense of $2 and $31 for the three months ended October 25, 2014 and October 26, 2013, respectively	(5)	(52)
Total- Available-for-sale investments	(27)	69
Change in unrealized gains and losses, net of tax benefit (expense) of $3 and $(3) for the three months ended October 25, 2014 and October 26, 2013, respectively	(53)	35
Net (gains) losses reclassified into earnings	4	(9)
Total- Cash flow hedging instruments	(49)	26
Net change in cumulative translation adjustment and other, net of tax benefit (expense) of $11 and $(3) for the three months ended October 25, 2014 and October 26, 2013, respectively	(150)	73
Other comprehensive income (loss)	(226)	168
Comprehensive income	1,602	2,164
Comprehensive (income) loss attributable to noncontrolling interests	0	(4)
Comprehensive income attributable to Cisco Systems, Inc.	$ 1,602	$ 2,160