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STOCKHOLDERS' EQUITY STOCKHOLDES' EQUITY - Stock Repurchase (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
Mar. 16, 2018
Oct. 31, 2016
Treasury Stock Transactions, Excluding Value of Shares Reissued [Abstract]            
Stock Repurchase Program, Authorized Amount         $ 350 $ 200
Treasury Stock, Shares, Acquired     1,030,120 773,352    
Treasury Stock, Value, Acquired, Cost Method $ 30 $ 40 $ 70 $ 40    
Unsettled treasury repurchase trade $ 1 $ 12 $ 1 $ 12