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DEBT Long Term Debt (Details) - USD ($)
$ in Millions
Apr. 30, 2019
Oct. 31, 2018
Debt Instrument [Line Items]    
Total debt $ 1,792 $ 1,790
Short-term debt 500 499
Long-term debt 1,292 1,291
Senior Notes 2019    
Debt Instrument [Line Items]    
Total debt 500 499
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 0 1
Senior Notes 2024    
Debt Instrument [Line Items]    
Total debt 597 597
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 3 3
Senior Notes 2027    
Debt Instrument [Line Items]    
Total debt 695 694
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 5 $ 6