Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 25, 2015	Apr. 26, 2014	Apr. 25, 2015	Apr. 26, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 2,437	$ 2,181	$ 6,662	$ 5,606
Change in net unrealized gains, net of tax benefit (expense) of $(57) and $(34) for the three and nine months ended April 25, 2015, respectively, and $(8) and $(131) for the corresponding periods of fiscal 2014, respectively	72	(8)	80	209
Net gains reclassified into earnings, net of tax expense of $16 and $42 for the three and nine months ended April 25, 2015, respectively, and $26 and $88 for the corresponding periods of fiscal 2014, respectively	(28)	(43)	(78)	(146)
Total- Available-for-sale investments	44	(51)	2	63
Change in unrealized gains and losses, net of tax benefit (expense) of $0 and $3 for the three and nine months ended April 25, 2015, respectively, and $(1) and $(2) for the corresponding periods of fiscal 2014, respectively	(32)	13	(160)	44
Net (gains) losses reclassified into earnings	64	(16)	94	(44)
Total- Cash flow hedging instruments	32	(3)	(66)	0
Net change in cumulative translation adjustment and actuarial gains and losses net of tax benefit (expense) of $14 and $50 for the three and nine months ended April 25, 2015, respectively, and $(5) for each of the corresponding periods of fiscal 2014	(80)	42	(423)	27
Other comprehensive income (loss)	(4)	(12)	(487)	90
Comprehensive income	2,433	2,169	6,175	5,696
Comprehensive (income) loss attributable to noncontrolling interests	5	6	(3)	(1)
Comprehensive income attributable to Cisco Systems, Inc.	$ 2,438	$ 2,175	$ 6,172	$ 5,695