Balance Sheet Details (Details) (USD $) In Millions, unless otherwise specified	Jan. 24, 2015	Jul. 26, 2014
Inventories:
Raw materials	$ 265us-gaap_InventoryRawMaterials	$ 77us-gaap_InventoryRawMaterials
Work in process	2us-gaap_InventoryWorkInProcess	5us-gaap_InventoryWorkInProcess
Distributor inventory and deferred cost of sales	733	595
Manufactured finished goods	577us-gaap_OtherInventory	606us-gaap_OtherInventory
Total finished goods	1,310us-gaap_InventoryFinishedGoods	1,201us-gaap_InventoryFinishedGoods
Service-related spares	274us-gaap_OtherInventoriesSpareParts	273us-gaap_OtherInventoriesSpareParts
Demonstration systems	39us-gaap_OtherInventoryDemo	35us-gaap_OtherInventoryDemo
Total	1,890us-gaap_InventoryNet	1,591us-gaap_InventoryNet
Property and equipment, net:
Land, buildings, and building and leasehold improvements	4,457	4,468
Computer equipment and related software	1,417us-gaap_PropertyPlantAndEquipmentOther	1,425us-gaap_PropertyPlantAndEquipmentOther
Production, engineering, and other equipment	5,745us-gaap_MachineryAndEquipmentGross	5,756us-gaap_MachineryAndEquipmentGross
Operating lease assets	343	362
Furniture and fixtures	498us-gaap_FurnitureAndFixturesGross	509us-gaap_FurnitureAndFixturesGross
Property, plant and equipment, gross	12,460us-gaap_PropertyPlantAndEquipmentGross	12,520us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization	(9,248)	(9,268)
Total	3,212us-gaap_PropertyPlantAndEquipmentNet	3,252us-gaap_PropertyPlantAndEquipmentNet
Other assets:
Deferred tax assets	1,448us-gaap_DeferredTaxAssetsNetNoncurrent	1,700us-gaap_DeferredTaxAssetsNetNoncurrent
Investments in privately held companies	857	899
Other	837us-gaap_PrepaidExpenseOtherNoncurrent	732us-gaap_PrepaidExpenseOtherNoncurrent
Total	3,142us-gaap_OtherAssetsNoncurrent	3,331us-gaap_OtherAssetsNoncurrent
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	14,021us-gaap_DeferredRevenue	14,142us-gaap_DeferredRevenue
Current	9,369us-gaap_DeferredRevenueCurrent	9,478us-gaap_DeferredRevenueCurrent
Noncurrent	4,652us-gaap_DeferredRevenueNoncurrent	4,664us-gaap_DeferredRevenueNoncurrent
Service
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	9,020	9,640
Product:
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	5,001	4,502
Product: \| Unrecognized revenue on product shipments and other deferred revenue
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	4,276	3,924
Product: \| Cash receipts related to unrecognized revenue from two-tier distributors
Deferred Revenue Arrangement [Line Items]
Deferred revenue:	$ 725	$ 578

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