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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)

X

- 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
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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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