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Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments in Cash Flow Hedging Relationships Included in Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2025 | Jul. 31, 2024 | Jul. 31, 2025 | Jul. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized gains (losses) arising during the period | $ 59 | $ (36) | $ (301) | $ (47)
Cash flow hedges: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized gains (losses) arising during the period | 59 | (36) | (301) | (47)
Foreign currency contracts | Cash flow hedges: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized gains (losses) arising during the period | 59 | (33) | (304) | (44)
Interest rate contracts | Cash flow hedges: |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Unrealized gains (losses) arising during the period | $ 0 | $ (3) | $ 3 | $ (3)

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