Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2016	Apr. 25, 2015	Apr. 30, 2016	Apr. 25, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 2,349	$ 2,437	$ 7,926	$ 6,662
Change in net unrealized gains, net of tax benefit (expense) of $(146) and $59 for the three and nine months ended April 30, 2016, respectively, and $(57) and $(34) for the corresponding periods of fiscal 2015, respectively	217	72	(95)	80
Net (gains) losses reclassified into earnings, net of tax (benefit) expense of $(2) and $(9) for the three and nine months ended April 30, 2016, and $16 and $42 for the corresponding periods of fiscal 2015, respectively	4	(28)	17	(78)
Total- Available-for-sale investments	221	44	(78)	2
Change in unrealized gains and losses, net of tax benefit (expense) of $(2) and $2 for the three and nine months ended April 30, 2016, respectively, and $2 and $8 for the corresponding periods of fiscal 2015, respectively	19	(30)	(1)	(155)
Net (gains) losses reclassified into earnings, net of tax (benefit) expense of $(2) and $(4) for the three and nine months ended April 30, 2016, and $(2) and $(5) for the corresponding periods of fiscal 2015, respectively	7	62	13	89
Total- Cash flow hedging instruments	26	32	12	(66)
Net change in cumulative translation adjustment and actuarial gains and losses net of tax benefit (expense) of $(9) and $(43) for the three and nine months ended April 30, 2016, respectively, and $14 and $50 for the corresponding periods of fiscal 2015, respectively	326	(80)	(231)	(423)
Other comprehensive income (loss)	573	(4)	(297)	(487)
Comprehensive income	2,922	2,433	7,629	6,175
Comprehensive (income) loss attributable to noncontrolling interests	7	5	9	(3)
Comprehensive income attributable to Cisco Systems, Inc.	$ 2,929	$ 2,438	$ 7,638	$ 6,172