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Accounting for Leases as a Lessor - Credit Risk Profile of Gross Financing Receivables (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Oct. 31, 2019
Gross financing receivables    
Gross financing receivables $ 8,736 $ 8,652
Low    
Gross financing receivables    
Gross financing receivables 4,435 4,432
Moderate    
Gross financing receivables    
Gross financing receivables 4,005 3,933
High    
Gross financing receivables    
Gross financing receivables $ 296 $ 287