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Balance Sheet Details (Details) - USD ($)
$ in Millions
Jan. 23, 2016
Jul. 25, 2015
Inventories:    
Raw materials $ 99 $ 114
Work in process 1 2
Distributor inventory and deferred cost of sales 564 610
Manufactured finished goods 446 593
Total finished goods 1,010 1,203
Service-related spares 224 258
Demonstration systems 28 50
Total 1,362 1,627
Property and equipment, net:    
Land, buildings, and building and leasehold improvements 4,573 4,495
Computer equipment and related software 1,344 1,310
Production, engineering, and other equipment 5,640 5,753
Operating lease assets 324 372
Furniture and fixtures 501 497
Property, plant and equipment, gross 12,382 12,427
Less: accumulated depreciation and amortization (8,996) (9,095)
Total 3,386 3,332
Other assets:    
Deferred tax assets 1,371 1,648
Investments in privately held companies 964 897
Other 733 618
Total 3,068 3,163
Deferred Revenue Arrangement [Line Items]    
Deferred revenue: 15,185 15,183
Current 9,796 9,824
Noncurrent 5,389 5,359
Service    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue: 9,657 9,757
Product:    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue: 5,528 5,426
Product: | Unrecognized revenue on product shipments and other deferred revenue    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue: 4,974 4,766
Product: | Cash receipts related to unrecognized revenue from two-tier distributors    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue: $ 554 $ 660