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SUPPLEMENTAL CASH FLOW INFORMATION (Cash, cash equivalents an restricted cash reconciliation) (Details) - USD ($) $ in Millions | Jan. 31, 2020 | Oct. 31, 2019 | Jan. 31, 2019 | Oct. 31, 2018
--- | --- | --- | --- | ---
Cash and cash equivalents | $ 1,691 | $ 1,598 |  |
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows | 1,693 | 1,600 | $ 1,102 | $ 917
Other Assets [Member] |  |  |  |
Restricted cash included in other assets | $ 2 | $ 2 |  |

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