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Restructuring and Other Charges - Narrative (Details) employee in Thousands, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 USD ($) employee | Apr. 30, 2021 USD ($) | Apr. 30, 2020 USD ($) | Apr. 30, 2021 USD ($) | Apr. 30, 2020 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Other charges |  | $ 5 | $ 53 | $ 9 | $ 87
Fiscal 2020 Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Estimated pre-tax charges | $ 1,000 |  |  |  |
Minimum | Fiscal 2020 Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected positions to be eliminated | employee | 7 |  |  |  |
Maximum | Fiscal 2020 Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected positions to be eliminated | employee | 9 |  |  |  |
Severance and EER | Fiscal 2020 Plan |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Estimated pre-tax charges | $ 800 |  |  |  |

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