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Financial Instruments - Cash Equivalents and Available-for-Sale Investments (Details) - USD ($) $ in Millions	Apr. 30, 2021	Oct. 31, 2020
Cash and Cash Equivalents [Line Items]
Debt securities, Amortized Cost	$ 129
Debt securities, Gross Unrealized Gain	16	$ 18
Debt securities, Fair Value	145
Total cash and equivalents and available-for-sale investments, Cost basis	2,977	2,234
Total cash equivalents and available-for-sale debt investments	2,993	2,252
Cost
Cash and Cash Equivalents [Line Items]
Total cash equivalents	2,848	2,106
Cost | Time deposits
Cash and Cash Equivalents [Line Items]
Total cash equivalents	893	939
Cost | Money market funds
Cash and Cash Equivalents [Line Items]
Total cash equivalents	1,955	1,167
Fair Value
Cash and Cash Equivalents [Line Items]
Total cash equivalents	2,848	2,106
Fair Value | Time deposits
Cash and Cash Equivalents [Line Items]
Total cash equivalents	893	939
Fair Value | Money market funds
Cash and Cash Equivalents [Line Items]
Total cash equivalents	1,955	1,167
Debt securities
Cash and Cash Equivalents [Line Items]
Debt securities, Amortized Cost	129	128
Debt securities, Gross Unrealized Gain	16	18
Debt securities, Fair Value	145	146
Foreign bonds
Cash and Cash Equivalents [Line Items]
Debt securities, Amortized Cost	112	108
Debt securities, Gross Unrealized Gain	15	17
Debt securities, Fair Value	127	125
Other debt securities
Cash and Cash Equivalents [Line Items]
Debt securities, Amortized Cost	17	20
Debt securities, Gross Unrealized Gain	1	1
Debt securities, Fair Value	$ 18	$ 21

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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 and investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities.

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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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