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Accounting for Leases as a Lessor - Summary of the Aging and Non-accrual Status of Gross Financing Receivables (Details) - USD ($)
$ in Millions
Apr. 30, 2021
Oct. 31, 2020
Financing Receivable, Past Due [Line Items]    
Financing receivables, net $ 9,142 $ 9,058
Gross financing receivables on non-accrual status 326 364
Gross financing receivables 90 days past due and still accruing interest 74 74
Unbilled    
Financing Receivable, Past Due [Line Items]    
Financing receivables, net 8,623 8,513
Current 1-30 days | Billed    
Financing Receivable, Past Due [Line Items]    
Financing receivables, net 351 340
Past due 31-60 days | Billed    
Financing Receivable, Past Due [Line Items]    
Financing receivables, net 29 43
Past due 61-90 days | Billed    
Financing Receivable, Past Due [Line Items]    
Financing receivables, net 27 22
Past due > 90 days | Billed    
Financing Receivable, Past Due [Line Items]    
Financing receivables, net $ 112 $ 140