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Supplementary Financial Information - Other Current Assets (Details) - USD ($)
$ in Millions
Oct. 31, 2018
Oct. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Value-added taxes receivable $ 865 $ 857
Available-for-sale investments 711 1,149
Supplier and other receivables 2,025 1,891
Prepaid and other current assets 1,445 1,224
Other current assets, total $ 5,046 $ 5,121