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Goodwill and Intangible Assets (Details) - USD ($) | 12 Months Ended
--- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
Goodwill |  |  |
Balance at beginning of period | $ 17,516,000,000 | $ 16,090,000,000 |
Goodwill acquired during the period | 104,000,000 | 1,427,000,000 |
Impairment of goodwill | (88,000,000) |  |
Changes due to foreign currency | 6,000,000 | 1,000,000 |
Goodwill adjustments | (1,000,000) | (2,000,000) |
Balance at end of period | 17,537,000,000 | 17,516,000,000 | $ 16,090,000,000
CMS Reporting Unit [Member] |  |  |
Goodwill |  |  |
Impairment of goodwill | (88,000,000) | 0 | 0
Balance at end of period | 0 |  |
Hybrid IT |  |  |
Goodwill |  |  |
Balance at beginning of period | 15,454,000,000 | 14,045,000,000 |
Goodwill acquired during the period | 101,000,000 | 1,410,000,000 |
Impairment of goodwill | (88,000,000) |  |
Changes due to foreign currency | 6,000,000 | 1,000,000 |
Goodwill adjustments | (1,000,000) | (2,000,000) |
Balance at end of period | 15,472,000,000 | 15,454,000,000 | 14,045,000,000
Intelligent Edge |  |  |
Goodwill |  |  |
Balance at beginning of period | 1,918,000,000 | 1,901,000,000 |
Goodwill acquired during the period | 3,000,000 | 17,000,000 |
Impairment of goodwill | 0 |  |
Changes due to foreign currency | 0 | 0 |
Goodwill adjustments | 0 | 0 |
Balance at end of period | 1,921,000,000 | 1,918,000,000 | 1,901,000,000
Financial Services |  |  |
Goodwill |  |  |
Balance at beginning of period | 144,000,000 | 144,000,000 |
Goodwill acquired during the period | 0 | 0 |
Impairment of goodwill | 0 |  |
Changes due to foreign currency | 0 | 0 |
Goodwill adjustments | 0 | 0 |
Balance at end of period | $ 144,000,000 | $ 144,000,000 | $ 144,000,000

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