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INCOME TAXES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2019 | Jul. 31, 2018
Income Tax Disclosure |  |  |  |
Provision (benefit) for income taxes | $ 31 | $ 6 | $ (189) | $ 581
Effective income tax rate | 14.00% | 2.50% | (27.50%) | 82.80%
Discrete tax expense (benefit) |  |  | $ (299) |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  | $ 23 |  | $ 23
Excess tax benefit from stock based compensation |  |  |  | (17)
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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