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Basis of Presentation - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 01, 2018 | Jan. 31, 2018 | Jan. 31, 2019 | Oct. 31, 2018
Retained Earnings Adjustments [Line Items] |  |  |  |
Accumulated deficit | $ 1,036 |  | $ 1,431 | $ 473
ASU 2017-07 | Selling, general and administrative expenses |  |  |  |
Retained Earnings Adjustments [Line Items] |  |  |  |
Reduction in interest and other |  | $ 60 |  |
ASU 2017-07 | Interest and other |  |  |  |
Retained Earnings Adjustments [Line Items] |  |  |  |
Reduction in interest and other |  | $ 60 |  |
ASU 2016-16 |  |  |  |
Retained Earnings Adjustments [Line Items] |  |  |  |
Prepaid Taxes | 353 |  |  |
Accumulated deficit |  |  | $ 353 |
Adjustments under Topic 606 |  |  |  |
Retained Earnings Adjustments [Line Items] |  |  |  |
Decrease in retained earnings | $ (212) |  |  |

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