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STOCKHOLDERS' EQUITY - Stock Repurchase Program (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
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Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2019 | Jul. 31, 2018 | Nov. 19, 2018 | Nov. 01, 2018 | May 28, 2015
2019 Repurchase Program [Member] |  |  |  |  |  |  |
Share repurchase program |  |  |  |  |  |  |
Share repurchase program authorized amount |  |  |  |  | $ 1,750 |  |
Stock repurchased and retired during period, (Shares) | 8.0 |  | 9.8 |  |  |  |
Stock repurchased and retired during period, (Value) | $ 549 |  | $ 674 |  |  |  |
Remaining authorized repurchase amount under share repurchase program | $ 1,076 |  | $ 1,076 |  |  |  |
2015 Repurchase Program |  |  |  |  |  |  |
Share repurchase program |  |  |  |  |  |  |
Share repurchase program authorized amount |  |  |  |  |  |  | $ 1,140
Stock repurchased and retired during period, (Shares) |  | 3.8 |  | 5.1 |  |  |
Stock repurchased and retired during period, (Value) |  | $ 243 |  | $ 336 |  |  |
Remaining authorized repurchase amount under share repurchase program |  |  |  |  |  | $ 188 |

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