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INCOME TAXES (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2019 | Apr. 30, 2018
Income Tax Disclosure |  |  |  |
Provision (benefit) for income taxes | $ 36 | $ 22 | $ (220) | $ 575
Effective income tax rate | 16.50% | 9.70% | (47.20%) | 125.00%
Discrete tax expense (benefit) |  |  | $ (299) |
Excess tax benefit from stock based compensation | $ (3) | $ (7) | $ (7) | $ (18)
U.S. Tax Cuts and Jobs Act of 2017 |  |  |  |
Income Tax Disclosure |  |  |  |
Discrete tax expense related to enactment of the Tax Act |  |  |  | $ 533

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