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Financial Instruments - Cash Equivalents and Available-for-Sale Investments (Details) - USD ($) $ in Millions	Oct. 31, 2021	Oct. 31, 2020
Cash and Cash Equivalents [Line Items]
Debt securities, amortized cost	$ 149	$ 128
Gross Unrealized Gains	15	18
Debt securities, fair value	164	146
Total cash equivalents and available-for sale investments, cost basis	2,450	2,234
Total cash equivalents and available-for-sale investments	2,465	2,252
Foreign bonds
Cash and Cash Equivalents [Line Items]
Debt securities, amortized cost	108	108
Gross Unrealized Gains	14	17
Debt securities, fair value	122	125
Other debt securities
Cash and Cash Equivalents [Line Items]
Debt securities, amortized cost	41	20
Gross Unrealized Gains	1	1
Debt securities, fair value	42	21
Fair Value
Cash and Cash Equivalents [Line Items]
Total cash equivalents	2,301	2,106
Fair Value | Time deposits
Cash and Cash Equivalents [Line Items]
Total cash equivalents	806	939
Fair Value | Money market funds
Cash and Cash Equivalents [Line Items]
Total cash equivalents	1,495	1,167
Cost
Cash and Cash Equivalents [Line Items]
Total cash equivalents	2,301	2,106
Cost | Time deposits
Cash and Cash Equivalents [Line Items]
Total cash equivalents	806	939
Cost | Money market funds
Cash and Cash Equivalents [Line Items]
Total cash equivalents	$ 1,495	$ 1,167

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Cash Equivalents and Available For Sale Securities, Cost Basis

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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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Amortized cost 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 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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