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Supplementary Financial Information - Other Current Assets (Details) - USD ($) $ in Millions | Apr. 30, 2021 | Oct. 31, 2020
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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

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