Balance Sheet Details (Details) (USD $) In Millions, unless otherwise specified	Apr. 28, 2012		Jul. 30, 2011
Inventories:
Raw materials	$ 114		$ 219
Work in process	37		52
Distributor inventory and deferred cost of sales	629		631
Manufactured finished goods	437		331
Total finished goods	1,066		962
Service-related spares	202		182
Demonstration systems	78		71
Total	1,497		1,486
Property and equipment, net:
Land, buildings, and building & leasehold improvements	4,547		4,760
Computer equipment and related software	1,454		1,429
Production, engineering, and other equipment	5,286		5,093
Operating lease assets	291	[1]	293	[1]
Furniture and fixtures	489		491
Property, plant and equipment, gross	12,067		12,066
Less accumulated depreciation and amortization	(8,433)	[1]	(8,150)	[1]
Total	3,634		3,916
Accumulated depreciation related to operating lease assets	176		169
Other assets:
Deferred tax assets	2,063		1,864
Investments in privately held companies	841		796
Other	746		441
Total	3,650		3,101
Deferred revenue:
Service	8,778		8,521
Unrecognized revenue on product shipments and other deferred revenue	2,943		3,003
Cash receipts related to unrecognized revenue from two-tier distributors	927		683
Total product deferred revenue	3,870		3,686
Total	12,648		12,207
Current	8,568		8,025
Noncurrent	4,080		4,182
Total	$ 12,648		$ 12,207

[1] Accumulated depreciation related to operating lease assets was $176 and $169 as of April 28, 2012 and July 30, 2011, respectively.