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Supplementary Financial Information - Schedule of Other Non-Current Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2025
Jul. 31, 2025
Oct. 31, 2024
Finite-Lived Intangible Assets [Line Items]      
Deferred tax assets $ 3,424 $ 3,424 $ 3,311
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Other non-current assets Other non-current assets Other non-current assets
Right-of-use assets $ 1,092 $ 1,092 $ 1,165
Intangible assets 1,071 1,071 1,319
Prepaid pension and post-retirement benefit assets 402 402 362
Deposits and prepaid 317 317 322
Other 1,267 1,267 1,129
Other non-current assets 7,573 7,573 $ 7,608
Customer Contracts, Customer Lists And Distribution Agreements      
Finite-Lived Intangible Assets [Line Items]      
Impairment charges 65 65  
Technology And Patents      
Finite-Lived Intangible Assets [Line Items]      
Impairment charges $ 27 $ 27