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STOCKHOLDER"S EQUITY - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May. 18, 2016 | Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2016 | Apr. 30, 2015
Dividends Paid |  |  |  |  |
Aggregate amount of cash dividends paid |  | $ 37 | $ 33 | $ 75 | $ 67
Cash dividends paid per common share |  | $ 0.115 | $ 0.100 | $ 0.230 | $ 0.200
Dividends Declared |  |  |  |  |
Subsequent Events [Abstract] |  |  |  |  |
Declaration date | May 18, 2016 |  |  |  |
Cash dividends declared per common share | $ 0.115 |  |  |  |
Aggregate amount of dividends declared | $ 37 |  |  |  |
Payment date | Jul. 27, 2016 |  |  |  |
Date of record | Jul. 05, 2016 |  |  |  |

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