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STOCKHOLDERS' EQUITY - Stock Repurchase Program (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2022 | Apr. 30, 2021 | Feb. 18, 2021 | Nov. 19, 2018
2019 Repurchase Program [Member] |  |  |  |  |  |
Share repurchase program |  |  |  |  |  |
Share repurchase program authorized amount |  |  |  |  |  | $ 1,750
Shares repurchased and retired during period, (Shares) |  | 164,422 |  | 3,050,000.00 |  |
Shares repurchased and retired during period, (Value) |  | $ 21 |  | $ 365 |  |
Remaining authorized repurchase amount under share repurchase program |  |  |  |  | $ 193 |
2021 Repurchase Program [Member] |  |  |  |  |  |
Share repurchase program |  |  |  |  |  |
Share repurchase program authorized amount |  |  |  |  | $ 2,000 |
Shares repurchased and retired during period, (Shares) | 1,751,000 | 1,388,000 | 4,658,000 | 1,388,000 |  |
Shares repurchased and retired during period, (Value) | $ 234 | $ 174 | $ 681 | $ 174 |  |
Remaining authorized repurchase amount under share repurchase program | $ 896 |  | $ 896 |  |  |

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