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Supplementary Financial Information - Other Current Assets (Details) - USD ($)
$ in Millions
Apr. 30, 2021
Oct. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Supplier and other receivables $ 1,960 $ 2,092
Prepaid and other current assets 1,289 1,104
Value-added taxes receivable 914 970
Available-for-sale investments 12 274
Other current assets $ 4,175 $ 4,440