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Supplementary Financial Information - Other Non-Current Assets (Details) - USD ($)
$ in Millions
Apr. 30, 2021
Oct. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Deferred tax assets $ 2,467 $ 2,515
Right-of-use assets from operating leases, net 1,074 1,107
Deposits and prepaid 705 337
Intangible assets 572 540
Other 578 527
Other non-current assets $ 5,396 $ 5,026