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SUPPLEMENTAL CASH FLOW INFORMATION Reconciliation of cash and cash equivalents (Details) - USD ($)
$ in Millions
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Oct. 31, 2017
Supplemental Cash Flow Elements [Abstract]        
Cash and Cash Equivalents, at Carrying Value $ 1,756 $ 1,598    
Restricted Cash and Cash Equivalents, Current 9 0    
Restricted Cash and Cash Equivalents, Noncurrent 2 2    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 1,767 $ 1,600 $ 917 $ 820