Balance Sheet Details - Schedule of Inventory (Details) - USD ($) $ in Millions	Jul. 31, 2017	Oct. 31, 2016
Inventory [Line Items]
Finished goods	$ 1,233	$ 1,182
Purchased parts and fabricated assemblies	911	558
Total	2,144	$ 1,740
SGI And Nimble Storage
Inventory [Line Items]
Total	$ 113