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Debt - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Jul. 31, 2019
Jul. 31, 2018
May 01, 2019
Apr. 30, 2019
Mar. 31, 2019
Oct. 31, 2018
Debt Instrument [Line Items]            
Payments of Debt Issuance Costs $ 9 $ 36        
Financial Services Operations | VFN Facility [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity 350     $ 550 $ 350  
Financial Services Operations | Trac Funding Facility [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity 150       $ 100  
Financial Services Operations | Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity 269   $ 748      
Investor Notes [Member]            
Debt Instrument [Line Items]            
Long-term Debt, Current Maturities 250          
Convertible Subordinated Debt [Member] | Manufacturing Operations [Member] | Four Point Seven Five Senior Subordinated Convertible Notes [Member] [Member]            
Debt Instrument [Line Items]            
Long-term Debt 0         $ 405
Line of Credit [Member] | Manufacturing Operations [Member]            
Debt Instrument [Line Items]            
Long-term Debt 1,560         1,570
Line of Credit [Member] | Financial Services Operations            
Debt Instrument [Line Items]            
Long-term Debt $ 1,000         $ 519
Notes Payable to Banks [Member] | Financial Services Operations            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount     $ 398