Restructuring and Impairments - Schedule of Impairment Charges (Details) - USD ($) $ in Millions	3 Months Ended
Jan. 31, 2019	Jan. 31, 2018	Oct. 31, 2018
Restructuring Cost and Reserve [Line Items]
Liability, Defined Benefit Plan, Noncurrent	$ (1,961)		$ (2,097)
Asset impairment charges	2	$ 2
Assets Leased to Others [Member]
Restructuring Cost and Reserve [Line Items]
Asset impairment charges	$ 2

Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant