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INCOME TAXES (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Income Tax Disclosure        
Provision (benefit) for income taxes $ 20 $ 36 $ 42 $ (220)
Effective income tax rate 16.50% 16.50% 12.40% (47.20%)
Discrete tax expense (benefit)       $ 299
Excess tax benefit from stock based compensation $ (14) $ (3)   $ (7)