Supplementary Financial Information - Schedule of Other Non-Current Assets (Details) - USD ($) $ in Millions	Jan. 31, 2025	Oct. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred tax assets	$ 3,283	$ 3,311
Intangible assets	$ 1,252	$ 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	$ 1,158	$ 1,165
Deposits and prepaid	301	322
Prepaid pension and post-retirement benefit assets	374	362
Other	1,229	1,129
Other non-current assets	$ 7,597	$ 7,608