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DEBT Summary of Long term debt incl. unamortized cost (Details) - USD ($)
$ in Millions
Oct. 31, 2019
Oct. 31, 2018
Debt Instrument [Line Items]    
Long-term Debt $ 1,788 $ 1,291
4.55% Senior Notes 2024    
Debt Instrument [Line Items]    
Senior Notes 597 597
Senior notes, Unamortized Discount (Premium) and Debt Issuance Costs, Net 3 3
4.60% Senior Notes 2027    
Debt Instrument [Line Items]    
Senior Notes 695 694
Senior notes, Unamortized Discount (Premium) and Debt Issuance Costs, Net 5 6
3.00% Senior Notes 2029    
Debt Instrument [Line Items]    
Senior Notes 496 $ 0
Senior notes, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 4