Supplementary Financial Information - Schedule of Other Non-Current Assets (Details) - USD ($) $ in Millions	Apr. 30, 2025	Oct. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred tax assets	$ 3,513	$ 3,311
Intangible assets	$ 1,228	$ 1,319
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other non-current assets	Other non-current assets
Right-of-use assets	$ 1,104	$ 1,165
Prepaid pension and post-retirement benefit assets	389	362
Deposits and prepaid	305	322
Other	1,138	1,129
Other non-current assets	$ 7,677	$ 7,608