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Taxes on Earnings - Deferred Tax Asset Valuation Allowance (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015
Valuation Allowance [Line Items] |  |  |  |
Valuation allowance for deferred tax assets | $ 7,906 | $ 8,807 | $ 8,520 | $ 7,114
(Decrease) increase in valuation allowances | (901) | 287 | 1,400 |
Deferred tax asset valuation allowance |  |  |  |
Valuation Allowance [Line Items] |  |  |  |
Valuation allowance for deferred tax assets | $ 7,900 | $ 8,800 | $ 8,500 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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