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Supplementary Financial Information - Inventory (Details) - USD ($)
$ in Millions
Apr. 30, 2021
Oct. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Finished goods $ 3,697 $ 3,662
Purchased parts and fabricated assemblies 3,805 2,301
Inventory $ 7,502 $ 5,963