FAIR VALUE MEASUREMENTS, Fair value measures and impairments (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Apr. 30, 2016 |
Apr. 30, 2015 |
Apr. 30, 2016 |
Apr. 30, 2015 |
|
| Long-Lived Assets | ||||
| Impairment long-lived assets held and used | $ 0 | $ 0 | $ 0 | $ 0 |
| Impairment of long-lived assets held for sale | 0 | 0 | 0 | 0 |
| Investments | ||||
| Impairment of Investments | $ 0 | $ 0 | $ 0 | $ 0 |