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Supplementary Financial Information - Other Non-Current Assets (Details) - USD ($)
$ in Millions
Apr. 30, 2020
Oct. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Deferred tax assets $ 2,452 $ 2,620
Right-of-use assets from operating leases, net 1,111  
Intangible assets 592 661
Tax indemnifications receivable 35 42
Other 839 801
Other non-current assets 5,029 4,124
Equity securities $ 52 $ 56