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Supplementary Financial Information - Other Current Assets (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2019 | Nov. 01, 2018 | Oct. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Value-added taxes receivable | $ 881 |  | $ 865
Available-for-sale investments | 425 |  | 711
Supplier and other receivables | 2,217 |  | 2,025
Prepaid and other current assets(2) | 1,284 |  | 1,445
Other current assets | 4,807 | $ 5,159 | $ 5,046
Capitalized Contract Cost [Line Items] |  |  |
Amortization | 21 |  |
Deferred contract fulfillment costs |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Deferred contract costs | 38 |  |
Contract acquisition costs |  |  |
Capitalized Contract Cost [Line Items] |  |  |
Deferred contract costs | $ 36 |  |

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