Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 24, 2015	Jan. 25, 2014	Jan. 24, 2015	Jan. 25, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 2,397	$ 1,429	$ 4,225	$ 3,425
Change in net unrealized gains, net of tax benefit (expense) of $9 and $23 for the three and six months ended January 24, 2015, respectively, and $(69) and $(122) for the corresponding periods of fiscal 2014, respectively	30	96	8	217
Net gains reclassified into earnings, net of tax expense of $24 and $26 for the three and six months ended January 24, 2015, respectively, and $31 and $62 for the corresponding periods of fiscal 2014, respectively	(45)	(51)	(50)	(103)
Total- Available-for-sale investments	(15)	45	(42)	114
Change in unrealized gains and losses, net of tax benefit (expense) of $0 and $3 for the three and six months ended January 24, 2015, respectively, and $1 and $(2) for the corresponding periods of fiscal 2014, respectively	(75)	(4)	(128)	31
Net (gains) losses reclassified into earnings	26	(19)	30	(28)
Total- Cash flow hedging instruments	(49)	(23)	(98)	3
Net change in cumulative translation adjustment and actuarial gains and losses net of tax benefit (expense) of $26 and $36 for the three and six months ended January 24, 2015, respectively, and $2 and $(1) for the corresponding periods of fiscal 2014, respectively	(193)	(88)	(343)	(15)
Other comprehensive income (loss)	(257)	(66)	(483)	102
Comprehensive income	2,140	1,363	3,742	3,527
Comprehensive (income) loss attributable to noncontrolling interests	(8)	(3)	(8)	(7)
Comprehensive income attributable to Cisco Systems, Inc.	$ 2,132	$ 1,360	$ 3,734	$ 3,520