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SHARE-BASED COMPENSATION Allocated Share-based compensation expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Jul. 31, 2025 | Jul. 31, 2024 | Jul. 31, 2025 | Jul. 31, 2024
Employee Service Share-based Compensation, Allocation of Recognized Period Costs |  |  |  |
Share-based compensation expense | $ 32 | $ 28 | $ 103 | $ 104
Cost of Products and Services |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs |  |  |  |
Share-based compensation expense | 13 | 9 | 35 | 32
Research and Development |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs |  |  |  |
Share-based compensation expense | 3 | 4 | 11 | 13
Selling, General and Administrative |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs |  |  |  |
Share-based compensation expense | $ 16 | $ 15 | $ 57 | $ 59

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