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Equity Method Investments (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 | May 31, 2016
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments in equity interests | $ 2,398 |  |  |  | $ 2,535 |  |  |  | $ 2,398 | $ 2,535 |  |
(Loss) earnings from equity interests | 15 | $ 11 | $ (10) | $ 22 | 1 | $ 1 | $ (3) | $ (22) | 38 | (23) | $ (76) |
Equity Method Investee | H3C |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sales to related party |  |  |  |  |  |  |  |  | 1,300 | 1,200 | 500 |
Purchases from related party |  |  |  |  |  |  |  |  | 273 | 331 | 169 |
Payable to H3C | 43 |  |  |  | 64 |  |  |  | 43 | 64 |  |
H3C |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investments in equity interests | $ 2,400 |  |  |  | $ 2,500 |  |  |  | $ 2,400 | 2,500 |  |
Ownership | 49.00% |  |  |  |  |  |  |  | 49.00% |  |  |
Cash dividend |  |  |  |  |  |  |  |  | $ 164 | 98 |  |
Basis difference |  |  |  |  |  |  |  |  |  |  |  | $ 2,534
Equity method goodwill |  |  |  |  |  |  |  |  |  |  |  | 1,674
Intangible assets |  |  |  |  |  |  |  |  |  |  |  | 749
In-process research and development |  |  |  |  |  |  |  |  |  |  |  | 188
Deferred tax liabilities |  |  |  |  |  |  |  |  |  |  |  | (152)
Other |  |  |  |  |  |  |  |  |  |  |  | $ 75
Weighted-average useful life |  |  |  |  |  |  |  |  | 5 years |  |  |
(Loss) earnings from equity interests |  |  |  |  |  |  |  |  | $ 38 | (23) | (76) |
Investment's earnings |  |  |  |  |  |  |  |  | 192 | 127 | 32 |
Amortization of difference in basis |  |  |  |  |  |  |  |  | 151 | 155 | 93 |
Elimination of intra-entity sales |  |  |  |  |  |  |  |  | $ 3 | $ 5 | $ 15 |

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