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INCOME TAXES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2018 | Jan. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2018 | Jul. 31, 2017 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
Income Tax Disclosure |  |  |  |  |  |  |  |
Provision for income taxes | $ 6 |  | $ 18 | $ 581 | $ 70 |  |  |
Effective income tax rate | 2.50% |  | 9.30% | 82.80% | 12.10% |  |  |
Net Discrete Tax Expense (Benefit) |  |  | $ (60) |  | $ (63) |  |  |
Unrecognized tax benefits reduction resulting from lapse of applicable statute of limitations | $ 23 |  |  |  | $ 40 |  |  |
U.S. federal corporate tax rate |  | 21.00% |  |  |  |  |  | 35.00%
Excess tax benefit from stock-based compensation | $ 17 |  |  |  |  |  |  |
U.S. Tax Cuts and Jobs Act of 2017 |  |  |  |  |  |  |  |
Income Tax Disclosure |  |  |  |  |  |  |  |
Discrete tax expense (benefit) |  | $ 533 |  |  |  |  |  |
Net transition tax |  | 480 |  |  |  |  |  |
Estimated provision associated with the impact of decreased U.S. corporate tax rate |  |  |  | $ 53 |  |  |  |
Provisional income tax expense related to one-time transition tax |  | 643 |  |  |  |  |  |
Income tax benefit due to reversal of deferred tax liability |  | $ (163) |  |  |  |  |  |
Settlement with Taxing Authority-Germany |  |  |  |  |  |  |  |
Income Tax Disclosure |  |  |  |  |  |  |  |
Discrete tax expense (benefit) |  |  | $ (51) |  |  |  |  |
Forecast |  |  |  |  |  |  |  |
Income Tax Disclosure |  |  |  |  |  |  |  |
U.S. federal corporate tax rate |  |  |  |  |  | 21.00% | 23.00% |

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