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Balance Sheet Details (Details) - USD ($)
$ in Millions
Apr. 28, 2018
Jul. 29, 2017
Inventories:    
Raw materials $ 459 $ 289
Work in Process 0 1
Finished goods:    
Distributor inventory and deferred cost of sales 476 451
Manufactured finished goods 659 552
Total finished goods 1,135 1,003
Service-related spares 273 300
Demonstration systems 33 23
Total 1,900 1,616
Gross property and equipment:    
Land, buildings, and building and leasehold improvements 4,768 4,926
Computer equipment and related software 1,111 1,258
Production, engineering, and other equipment 5,709 5,707
Operating lease assets 370 356
Furniture and fixtures 368 572
Total gross property and equipment 12,326 12,819
Less: accumulated depreciation and amortization (9,244) (9,497)
Total 3,082 3,322
Deferred Revenue Arrangement [Line Items]    
Deferred revenue: 18,953 18,494
Current 11,301 10,821
Noncurrent 7,652 7,673
Product:    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue: 7,993 7,192
Service    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue: 10,960 11,302
Deferred revenue related to recurring software and subscription offers | Product:    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue: 5,635 4,971
Other product deferred revenue | Product:    
Deferred Revenue Arrangement [Line Items]    
Deferred revenue: $ 2,358 $ 2,221