Financial Instruments - Schedule of Cash Equivalents and Available-for-Sale Investments (Details) - USD ($) $ in Millions	Jul. 31, 2026	Oct. 31, 2025
Cash Equivalents
Cost	$ 1,412	$ 1,878
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	1,412	1,878
Available-for-Sale Investments
Cost	92	107
Gross Unrealized Gain	27	27
Gross Unrealized Loss	0	0
Fair Value	119	134
Total cash equivalents and available-for-sale investments, cost	1,504	1,985
Total cash equivalents and available-for-sale investments, gross unrealized gain	27	27
Total cash equivalents and available-for-sale investments, gross unrealized loss	0	0
Total cash equivalents and available-for-sale investments, fair value	1,531	2,012
Government debt
Cash Equivalents
Cost	1,412	1,878
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	1,412	1,878
Financial institution instruments
Available-for-Sale Investments
Debt securities, cost	3	3
Debt securities, gross unrealized gain	0	0
Debt securities, gross unrealized loss	0	0
Debt securities, fair value	3	3
Marketable securities and mutual funds
Available-for-Sale Investments
Equity securities, cost	89	104
Equity securities, gross unrealized gain	27	27
Equity securities, gross unrealized loss	0	0
Equity securities, fair value	116	131
Debt securities, restricted	$ 46	$ 63

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Cash And Cash Equivalents, Gross Unrealized Losses

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Cash Equivalents and Available For Sale Securities, Amortized Cost Basis, Excluding Accrued Interest

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Cash Equivalents and Available For Sale Securities, Fair Value, Excluding Accrued Interest

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Cash Equivalents and Available For Sale Securities, Accumulated Gross Unrealized Gain, before Tax

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Debt Securities, Available-for-sale, Excluding Accrued Interest And Equity Securities, FV-NI

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Debt Securities, Available-For-Sale, Excluding Accrued Interest And Equity Securities, FV-NI, Amortized Cost

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Equity Securities, FV-NI, Accumulated Gross Unrealized Gain, before Tax

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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