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DEBT Long Term Debt (Details) - USD ($)
$ in Millions
Jul. 31, 2020
Oct. 31, 2019
Debt Instrument    
Total debt $ 1,789 $ 1,788
Senior Notes 2024    
Debt Instrument    
Total debt 598 597
Unamortized costs 2 3
Senior Notes 2027    
Debt Instrument    
Total debt 695 695
Unamortized costs 5 5
Senior Notes 2029    
Debt Instrument    
Total debt 496 496
Unamortized costs $ 4 $ 4