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STOCKHOLDERS' EQUITY (Stock Repurchase Program) (Details) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
May 29, 2019
Condensed Balance Sheet Statements, Captions [Line Items]          
Stock Repurchase Program, Authorized Amount         $ 500
Treasury Stock, Shares, Acquired     2,047,166 1,790,420  
Treasury Stock, Value, Acquired, Cost Method $ 0 $ 60 $ 195 $ 130