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Supplementary Financial Information - Inventory (Details) - USD ($)
$ in Millions
Oct. 31, 2018
Oct. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Finished goods $ 4,019 $ 3,857
Purchased parts and fabricated assemblies 2,043 1,929
Inventory $ 6,062 $ 5,786