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Supplementary Financial Information - Other Current Assets (Details) - USD ($)
$ in Millions
Apr. 30, 2017
Oct. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Value-added taxes receivable $ 804 $ 795
Supplier and other receivables 1,722 1,700
Prepaid and other current assets 1,026 1,087
Other current assets $ 3,552 $ 3,582