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SHARE-BASED COMPENSATION Allocated Share-based compensation expense (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Oct. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense $ 21 $ 23  
Inventory      
Share-based Compensation, Allocation and Classification in Financial Statements      
Capitalized share-based compensation 0   $ 0
Cost of Products and Services      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense 6 6  
Research and Development Expense      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense 2 2  
Selling, General and Administrative Expenses      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense $ 13 $ 15