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OVERVIEW, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions | Jul. 31, 2020 | Oct. 31, 2019 | Jul. 31, 2019 | Oct. 31, 2018
--- | --- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |  |
Assets | $ 9,546 | $ 9,452 |  |
Fair Value of Financial Instruments |  |  |  |
Fair value of senior notes in excess of carrying value | 197 | 62 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  |  |  |
Cash and cash equivalents | 1,358 | 1,382 |  |
Restricted Cash | 6 | 6 |  |
Cash, cash equivalents, restricted cash and restricted cash equivalents | 1,364 | 1,388 | $ 1,771 | $ 2,254
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Assets | $ 65 | $ 29 |  |

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