Supplementary Financial Information - Other Non-Current Assets (Details) - USD ($) $ in Millions	Jan. 31, 2022	Oct. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred tax assets	$ 2,886	$ 2,917
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other non-current assets	Other non-current assets
Right-of-use assets from operating leases, net	$ 1,174	$ 1,192
Prepaid pension asset	804	766
Intangible assets	716	784
Deposits and prepaid	690	734
Other	770	698
Other non-current assets	$ 7,040	$ 7,091