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Acquisitions and Divestitures (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 01, 2017 | Oct. 31, 2016 | Oct. 31, 2018 | Oct. 31, 2017
Discontinued Operations and Disposal Groups [Abstract] |  |  |  |
Goodwill | $ 339 | $ 5,622 | $ 5,968 | $ 5,622
Amortizable intangible assets | 521 |  |  |
Net assets assumed | 191 |  |  |
Total fair value of consideration | $ 1,051 |  |  |
Divestiture | Open Text Corporation |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Consideration to divest |  | 475 |  |
Gain recognized |  | $ 401 |  |

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