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DEBT Summary of Long term debt incl. unamortized cost (Details) - USD ($)
$ in Millions
Oct. 31, 2020
Oct. 31, 2019
Debt Instrument [Line Items]    
Long-term Debt $ 1,789 $ 1,788
4.55% Senior Notes 2024    
Debt Instrument [Line Items]    
Senior Notes 598 597
Senior notes, Unamortized Discount (Premium) and Debt Issuance Costs, Net 2 3
4.60% Senior Notes 2027    
Debt Instrument [Line Items]    
Senior Notes 695 695
Senior notes, Unamortized Discount (Premium) and Debt Issuance Costs, Net 5 5
3.00% Senior Notes 2029    
Debt Instrument [Line Items]    
Senior Notes 496 496
Senior notes, Unamortized Discount (Premium) and Debt Issuance Costs, Net $ 4 $ 4