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Discontinued Operations - Schedule of Discontinued Operations, Financial Results (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2018 | Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net loss from discontinued operations | $ 15 | $ (1) | $ (72) | $ (46) | $ 146 | $ (120) | $ (134) | $ 16 | $ (104) | $ (92) | $ (76)
Everett SpinCo, Inc. and Seattle SpinCo, Inc. | Spinoff |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  | 0 | 8,511 | 19,843
Cost of revenue |  |  |  |  |  |  |  |  | 0 | 5,890 | 15,000
Expenses |  |  |  |  |  |  |  |  | 51 | 3,063 | 4,596
Interest and other, net |  |  |  |  |  |  |  |  | 58 | 39 | 28
(Loss) earnings from discontinued operations before taxes |  |  |  |  |  |  |  |  | (109) | (481) | 219
Benefit (provision) for taxes |  |  |  |  |  |  |  |  | 5 | 389 | (295)
Net loss from discontinued operations |  |  |  |  |  |  |  |  | $ (104) | $ (92) | $ (76)

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