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Taxes on Earnings - Schedule of Deferred Tax Assets for Net Operating Loss Carryforwards (Details) - USD ($) $ in Millions | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015
--- | --- | --- | --- | ---
Operating Loss Carryforwards [Line Items] |  |  |  |
Gross NOLs | $ 29,538 |  |  |
Valuation allowance | (7,906) | $ (8,807) | $ (8,520) | $ (7,114)
Operating loss carryforwards |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Taxes on NOLs | 8,002 |  |  |
Valuation allowance | (7,318) |  |  |
Federal |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Gross NOLs | 456 |  |  |
Federal | Operating loss carryforwards |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Taxes on NOLs | 96 |  |  |
Valuation allowance | 0 |  |  |
State |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Gross NOLs | 2,644 |  |  |
State | Operating loss carryforwards |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Taxes on NOLs | 163 |  |  |
Valuation allowance | (71) |  |  |
Foreign |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Gross NOLs | 26,438 |  |  |
Foreign | Operating loss carryforwards |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Deferred Taxes on NOLs | 7,743 |  |  |
Valuation allowance | $ (7,247) |  |  |

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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 operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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