Balance Sheet Details (Details) - USD ($) $ in Millions	Apr. 29, 2017	Jul. 30, 2016
Inventories:
Raw materials	$ 209	$ 91
Finished goods:
Distributor inventory and deferred cost of sales	515	457
Manufactured finished goods	332	415
Total finished goods	847	872
Service-related spares	286	236
Demonstration systems	24	18
Total	1,366	1,217
Gross property and equipment:
Land, buildings, and building and leasehold improvements	4,848	4,778
Computer equipment and related software	1,266	1,288
Production, engineering, and other equipment	5,701	5,658
Operating lease assets	322	296
Furniture and fixtures	567	543
Total gross property and equipment	12,704	12,563
Less: accumulated depreciation and amortization	(9,309)	(9,057)
Total	3,395	3,506
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	17,322	16,472
Current	10,344	10,155
Noncurrent	6,978	6,317
Product:
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	6,790	5,851
Service
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	10,532	10,621
Deferred revenue related to recurring software and subscription businesses | Product:
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	4,352	3,308
Deferred revenue related to two-tier distributors | Product:
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	311	377
Other product deferred revenue | Product:
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	$ 2,127	$ 2,166