Restructuring, Impairments and Divestitures - Schedule of Impairment Charges (Details) - USD ($) $ in Millions	3 Months Ended
Jan. 31, 2020	Jan. 31, 2019	Oct. 31, 2019
Restructuring Cost and Reserve [Line Items]
Liability, Defined Benefit Plan, Noncurrent	$ (2,056)		$ (2,103)
Asset impairment charges	$ 0	$ 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
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant