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Financing Receivables and Operating Leases (Detail 2) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2018
Oct. 31, 2017
Leases [Abstract]          
Sold $ 174 $ 130      
Gross financing receivables          
Financing receivables, gross       $ 8,256 $ 7,844
Aging and non-accrual status of gross financing receivables          
Unbilled sales-type and direct-financing lease receivables       7,852 7,462
Gross financing receivables on non-accrual status       226 188
Gross financing receivables 90 days past due and still accruing interest       113 133
Period past due, after which a write-off or specific reserve is created 180 days        
Allowance for doubtful accounts          
Balance at beginning of year $ 86 89 $ 95    
Provision for doubtful accounts 49 23 11    
Write-offs (15) (26) (17)    
Balance at end of year 120 86 89    
Gross financing receivables collectively evaluated for loss       7,917 7,523
Gross financing receivables individually evaluated for loss       339 321
Financing receivables, gross       8,256 7,844
Allowance for financing receivables collectively evaluated for loss       78 67
Allowance for financing receivables individually evaluated for loss       42 19
Total $ 86 $ 89 $ 95 120 86
Period past due, after which account is put on non-accrual status 90 days        
Operating lease assets          
Equipment leased to customers       7,290 7,356
Accumulated depreciation       (3,078) (2,943)
Operating lease assets, net       4,212 4,413
Minimum future rentals on non-cancelable operating leases:          
2019       1,901  
2020       1,156  
2021       477  
2022       69  
2023       9  
Thereafter       1  
Total       3,613  
Low          
Gross financing receivables          
Financing receivables, gross       4,238 4,156
Allowance for doubtful accounts          
Financing receivables, gross       4,238 4,156
Moderate          
Gross financing receivables          
Financing receivables, gross       3,805 3,556
Allowance for doubtful accounts          
Financing receivables, gross       3,805 3,556
High          
Gross financing receivables          
Financing receivables, gross       213 132
Allowance for doubtful accounts          
Financing receivables, gross       213 132
Current 1-30 days          
Aging and non-accrual status of gross financing receivables          
Past due       275 257
Past due 31-60 days          
Aging and non-accrual status of gross financing receivables          
Past due       42 52
Past due 61-90 days          
Aging and non-accrual status of gross financing receivables          
Past due       13 15
Past due 90 days          
Aging and non-accrual status of gross financing receivables          
Past due       $ 74 $ 58