Consolidated Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 25, 2014	Jan. 26, 2013	Jan. 25, 2014	Jan. 26, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 1,429	$ 3,143	$ 3,425	$ 5,235
Change in net unrealized gains, net of tax benefit (expense) of $(69) and $(122) for the three and six months ended January 25, 2014, respectively, and $(47) and $(46) for the corresponding periods of fiscal 2013, respectively	96	69	217	73
Net gains reclassified into earnings, net of tax expense of $31 and $62 for the three and six months ended January 25, 2014, respectively, and $5 and $14 for the corresponding periods of fiscal 2013, respectively	(51)	(9)	(103)	(26)
Total available-for-sale investments	45	60	114	47
Change in unrealized gains and losses, net of tax (expense) benefit of $1 and $(2) for the three and six months ended January 25, 2014, respectively, and $(1) for each of the corresponding periods of fiscal 2013, respectively	(4)	2	31	68
Net (gains) losses reclassified into earnings	(19)	(8)	(28)	(3)
Total cash flow hedging instruments	(23)	(6)	3	65
Net change in cumulative translation adjustment and other, net of tax benefit (expense) of $2 and $(1) for the three and six months ended January 25, 2014, respectively, and $(5) and $(15) for the corresponding periods of fiscal 2013, respectively	(88)	6	(15)	120
Other comprehensive (loss) income	(66)	60	102	232
Comprehensive income	1,363	3,203	3,527	5,467
Comprehensive (income) loss attributable to noncontrolling interests	(3)	5	(7)	5
Comprehensive income attributable to Cisco Systems, Inc.	$ 1,360	$ 3,208	$ 3,520	$ 5,472