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Financing Receivables and Operating Leases - Aging and Allowance (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 31, 2017
Oct. 31, 2016
Jan. 31, 2017
Oct. 31, 2016
Gross financing receivables        
Period past due, after which a write-off or specific reserve is created 180 days      
Allowance for doubtful accounts        
Balance at beginning of period $ 89 $ 95    
Provision for doubtful accounts 2 11    
Write-offs (7) (17)    
Balance at end of period 84 89    
Gross financing receivables collectively evaluated for loss     $ 6,546 $ 6,667
Gross financing receivables individually evaluated for loss     271 283
Financing receivables, gross     6,817 6,950
Allowance for financing receivables collectively evaluated for loss     66 73
Allowance for financing receivables individually evaluated for loss     18 16
Total $ 89 $ 95 84 89
Period past due, after which account is put on non-accrual status 90 days      
Aging and non-accrual status of gross financing receivables        
Current 1-30 days     302 337
Past due 31-60 days     47 47
Past due 61-90 days     23 12
Past due 90 days     63 59
Unbilled sales-type and direct-financing lease receivables     6,382 6,495
Gross financing receivables on non-accrual status     180 163
Gross financing receivables 90 days past due and still accruing interest     91 120
Operating lease assets        
Equipment leased to customers     5,481 5,467
Accumulated depreciation     (2,176) (2,134)
Operating lease assets, net     3,305 3,333
Low        
Allowance for doubtful accounts        
Financing receivables, gross     3,378 3,484
Moderate        
Allowance for doubtful accounts        
Financing receivables, gross     3,355 3,382
High        
Allowance for doubtful accounts        
Financing receivables, gross     $ 84 $ 84