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Accounting for Leases as a Lessor - Allowance for Doubtful Accounts for Financing Receivables (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 31, 2020
Oct. 31, 2018
Allowance for doubtful accounts    
Balance at beginning of period $ 131  
Provision for doubtful accounts 5 $ 33
Write-offs (3) (22)
Balance at end of period $ 133 $ 120