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Financial Instruments - Schedule of Cash Equivalents and Available-for-Sale Investments (Details) - USD ($) $ in Millions	Apr. 30, 2021	Oct. 31, 2020
Cash Equivalents:
Cost	$ 2,305	$ 3,932
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	2,305	3,932
Available-for-Sale Investments:
Cost	56	316
Gross Unrealized Gain	19	16
Gross Unrealized Loss	0	0
Fair Value	75	332
Total cash equivalents and available-for-sale investments, Cost	2,361	4,248
Total cash equivalents and available-for-sale investments, Gross Unrealized Gain	19	16
Total cash equivalents and available-for-sale investments, Gross Unrealized Loss	0	0
Total cash equivalents and available-for-sale investments, Fair Value	2,380	4,264
Corporate debt
Cash Equivalents:
Cost	1,374	1,700
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	1,374	1,700
Available-for-Sale Investments:
Debt securities, Cost	0	169
Debt securities, Gross Unrealized Gain	0	0
Debt securities, Gross Unrealized Loss	0	0
Debt securities, fair value	0	169
Financial institution instruments
Cash Equivalents:
Cost	0	59
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	0	59
Available-for-Sale Investments:
Debt securities, Cost	12	32
Debt securities, Gross Unrealized Gain	0	0
Debt securities, Gross Unrealized Loss	0	0
Debt securities, fair value	12	32
Government debt
Cash Equivalents:
Cost	931	2,173
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	931	2,173
Available-for-Sale Investments:
Debt securities, Cost	0	73
Debt securities, Gross Unrealized Gain	0	0
Debt securities, Gross Unrealized Loss	0	0
Debt securities, fair value	0	73
Mutual funds
Available-for-Sale Investments:
Equity securities, Cost	44	42
Equity securities, Gross Unrealized Gain	19	16
Equity securities, Gross Unrealized Loss	0	0
Equity securities, Fair Value	$ 63	$ 58

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