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Supplementary Financial Information - Other Non-Current Assets (Details) - USD ($)
$ in Millions
Oct. 31, 2020
Oct. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Deferred tax assets $ 2,515 $ 2,620
Right-of-use assets from operating leases 1,107  
Intangible assets 540 661
Other 864 843
Other non-current assets, total 5,026 4,124
Available-for-sale investments $ 58 $ 56