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INCOME TAXES (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2017 | Apr. 30, 2016 | Jan. 31, 2017
Income Tax Disclosure |  |  |  |  |
Effective income tax rate | 14.10% | 22.20% | 13.50% | 18.10% |
Provision for income taxes | $ 27 | $ 26 | $ 52 | $ 47 |
Net Discrete Tax Expense (Benefit) | (1) | 3 | (3) | (3) |
Related to Settlement of Audit |  |  |  |  |
Income Tax Disclosure |  |  |  |  |
Discrete Tax Expense (Benefit) |  |  | (7) |  |
Incremental taxes |  |  |  |  | $ 7
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 14 |  |  |  |
U.S. Research & Development Tax Credit Extension |  |  |  |  |
Income Tax Disclosure |  |  |  |  |
Discrete Tax Expense (Benefit) |  |  |  | (5) |
Pension Curtailment and Settlement |  |  |  |  |
Income Tax Disclosure |  |  |  |  |
Discrete Tax Expense (Benefit) |  |  | 11 | 6 |
Return To Provision Adjustment |  |  |  |  |
Income Tax Disclosure |  |  |  |  |
Discrete Tax Expense (Benefit) | (5) | 7 |  | (9) |
Return To Provision Adjustment - out of period [Member] |  |  |  |  |
Income Tax Disclosure |  |  |  |  |
Discrete Tax Expense (Benefit) |  | 5 |  |  |
Realization of tax credits [Member] |  |  |  |  |
Income Tax Disclosure |  |  |  |  |
Discrete Tax Expense (Benefit) | $ 4 | (8) |  |  |
Miscellaneous Other Return To Provision Adjustment [Member] [Member] |  |  |  |  |
Income Tax Disclosure |  |  |  |  |
Discrete Tax Expense (Benefit) |  | 2 |  |  |
Other Discrete Items |  |  |  |  |
Income Tax Disclosure |  |  |  |  |
Discrete Tax Expense (Benefit) |  | $ 2 | $ (6) | $ 2 |

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