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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
Jan. 31, 2020
Oct. 31, 2019
Billed:    
Current 1-30 days $ 350 $ 301
Past due 31-60 days 53 62
Past due 61-90 days 32 15
Past due 90 days 111 88
Unbilled sales-type and direct-financing lease receivables 8,190 8,186
Financing receivables, gross 8,736 8,652
Gross financing receivables on non-accrual status 322 276
Gross financing receivables 90 days past due and still accruing interest $ 164 $ 121