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Accounting for Leases as a Lessee - Operating Lease Cost (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Leases [Abstract]    
Operating lease cost $ 207 $ 236
Finance lease cost 5 8
Sublease rental income (35) (61)
Total lease cost $ 177 $ 183