Consolidated Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 26, 2013	Jan. 28, 2012	Jan. 26, 2013	Jan. 28, 2012
Statement of Other Comprehensive Income [Abstract]
Net Income (Loss) Attributable to Parent	$ 3,143	$ 2,182	$ 5,235	$ 3,959
Change in net unrealized gains, net of tax benefit (expense) of $(47) and $(46) for the three and six months ended January 26, 2013, respectively, and $2 and $28 for the corresponding periods of fiscal 2012, respectively	69	10	73	(43)
Net gains reclassified into earnings, net of tax effects of $5 and $14 for the three and six months ended January 26, 2013, respectively, and $14 and $16 for the corresponding periods of fiscal 2012, respectively	(9)	(24)	(26)	(30)
Total available-for-sale investments	60	(14)	47	(73)
Change in unrealized gains and losses, net of tax expense of $(1) for each of the three and six months ended January 26, 2013	2	(44)	68	(94)
Net (gains) losses reclassified into earnings	(8)	26	(3)	26
Total cash flow hedging instruments	(6)	(18)	65	(68)
Net change in cumulative translation adjustment and other, net of tax (expense) benefit of $(5) and $(15) for the three and six months ended January 26, 2013, respectively, and $10 and $31 for the corresponding periods of fiscal 2012, respectively	6	(106)	120	(317)
Other comprehensive income (loss)	60	(138)	232	(458)
Comprehensive income	3,203	2,044	5,467	3,501
Comprehensive loss attributable to noncontrolling interests	5	7	5	14
Comprehensive income attributable to Cisco Systems, Inc.	$ 3,208	$ 2,051	$ 5,472	$ 3,515