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REVENUE Contract cost (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Oct. 31, 2020 | Oct. 31, 2019 | Nov. 01, 2019 | Nov. 01, 2018
Capitalized Contract Cost [Line Items] |  |  |  |
Balance at beginning of period | $ 28 | $ 0 |  |
Costs capitalized on November 1, 2018 due to ASC 606 adoption |  |  | $ 0 | $ 29
Costs capitalized during the period | 86 | 63 |  |
Costs amortized during the period | (83) | (64) |  |
Balance at end of period | $ 31 | $ 28 |  |

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- Definition Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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