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Accounting for Leases as a Lessor - Allowance for Doubtful Accounts for Financing Receivables (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Apr. 30, 2025
Oct. 31, 2024
Allowance for doubtful accounts    
Balance at beginning of period $ 194 $ 243
Provision for credit losses 36 50
Adjustment to the existing allowance (1) (4)
Write-offs (20) (95)
Balance at end of period $ 209 $ 194