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Supplementary Financial Information - Other Current Assets (Details) - USD ($)
$ in Millions
Apr. 30, 2020
Oct. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Supplier and other receivables $ 2,094 $ 1,951
Prepaid and other current assets 1,173 967
Value-added taxes receivable 839 957
Other current assets $ 4,106 $ 3,875