Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 23, 2016	Jan. 24, 2015	Jan. 23, 2016	Jan. 24, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 3,147	$ 2,397	$ 5,577	$ 4,225
Change in net unrealized gains, net of tax benefit (expense) of $149 and $205 for the three and six months ended January 23, 2016, respectively, and $9 and $23 for the corresponding periods of fiscal 2015, respectively	(212)	30	(312)	8
Net (gains) losses reclassified into earnings, net of tax (benefit) expense of $(7) for each of the three and six months ended January 23, 2016, and $24 and $26 for the corresponding periods of fiscal 2015, respectively	12	(45)	13	(50)
Total- Available-for-sale investments	(200)	(15)	(299)	(42)
Change in unrealized gains and losses, net of tax benefit (expense) of $0 and $2 for the three and six months ended January 23, 2016, respectively, and $0 and $3 for the corresponding periods of fiscal 2015, respectively	(20)	(75)	(22)	(128)
Net (gains) losses reclassified into earnings	5	26	8	30
Total- Cash flow hedging instruments	(15)	(49)	(14)	(98)
Net change in cumulative translation adjustment and actuarial gains and losses net of tax benefit (expense) of $5 and $(34) for the three and six months ended January 23, 2016, respectively, and $26 and $36 for the corresponding periods of fiscal 2015, respectively	(341)	(193)	(557)	(343)
Other comprehensive income (loss)	(556)	(257)	(870)	(483)
Comprehensive income	2,591	2,140	4,707	3,742
Comprehensive (income) loss attributable to noncontrolling interests	1	(8)	2	(8)
Comprehensive income attributable to Cisco Systems, Inc.	$ 2,592	$ 2,132	$ 4,709	$ 3,734