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NET INCOME PER SHARE (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Numerator:        
Net income (loss) $ 205 $ 164 $ (115) $ 332
Denominators:        
Basic weighted-average shares (in shares) 322,000,000 321,000,000 323,000,000 322,000,000
Potential common shares - stock options and other employee stock plans (in shares) 4,000,000 4,000,000 0 3,000,000
Diluted weighted average shares (in shares) 326,000,000 325,000,000 323,000,000 325,000,000
Antidilutive securities excluded from computation of Earnings Per Share, amount (in shares) 96,800 1,000 6,600,000 500