Balance Sheet Details (Details) - USD ($)	Jan. 28, 2017	Jul. 30, 2016
Inventories:
Raw materials	$ 149,000,000	$ 91,000,000
Work in process	1,000,000	0
Finished goods:
Distributor inventory and deferred cost of sales	422,000,000	457,000,000
Manufactured finished goods	413,000,000	415,000,000
Total finished goods	835,000,000	872,000,000
Service-related spares	260,000,000	236,000,000
Demonstration systems	19,000,000	18,000,000
Total	1,264,000,000	1,217,000,000
Gross property and equipment:
Land, buildings, and building and leasehold improvements	4,800,000,000	4,778,000,000
Computer equipment and related software	1,301,000,000	1,288,000,000
Production, engineering, and other equipment	5,680,000,000	5,658,000,000
Operating lease assets	297,000,000	296,000,000
Furniture and fixtures	560,000,000	543,000,000
Total gross property and equipment	12,638,000,000	12,563,000,000
Less: accumulated depreciation and amortization	(9,216,000,000)	(9,057,000,000)
Total	3,422,000,000	3,506,000,000
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	17,086,000,000	16,472,000,000
Current	10,243,000,000	10,155,000,000
Noncurrent	6,843,000,000	6,317,000,000
Product:
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	6,561,000,000	5,851,000,000
Service
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	10,525,000,000	10,621,000,000
Deferred revenue related to recurring software and subscription businesses | Product:
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	3,997,000,000	3,308,000,000
Deferred revenue related to two-tier distributors | Product:
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	401,000,000	377,000,000
Other product deferred revenue | Product:
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	$ 2,163,000,000	$ 2,166,000,000