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Supplementary Financial Information - Interest and Other, Net (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2020 | Oct. 31, 2019 | Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2020 | Jul. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Tax indemnifications | $ 30 | $ 57 | $ (1) | $ (784) | $ 0 | $ (769)
Interest expense on borrowings |  |  | (55) | (57) | (176) | (182)
Loss on extinguishment of debt |  |  | (40) | 0 | (40) | 0
Other, net |  |  | 68 | 10 | 201 | 49
Interest and other, net |  |  | $ (28) | (831) | $ (15) | (902)
Change in tax indemnification |  |  |  | $ 764 |  | $ 764

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