Financial Instruments - Schedule of Cash Equivalents and Available-for-Sale Investments (Details) - USD ($) $ in Millions	Jan. 31, 2022	Oct. 31, 2021
Cash Equivalents:
Cost	$ 1,974	$ 3,043
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	1,974	3,043
Available-for-Sale Investments:
Cost	47	47
Gross Unrealized Gain	22	29
Gross Unrealized Loss	0	0
Fair Value	69	76
Total cash equivalents and available-for-sale investments, Cost	2,021	3,090
Total cash equivalents and available-for-sale investments, Gross Unrealized Gain	22	29
Total cash equivalents and available-for-sale investments, Gross Unrealized Loss	0	0
Total cash equivalents and available-for-sale investments, Fair Value	2,043	3,119
Corporate debt
Cash Equivalents:
Cost	1,047	1,112
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	1,047	1,112
Government debt
Cash Equivalents:
Cost	927	1,931
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	927	1,931
Financial institution instruments
Available-for-Sale Investments:
Debt securities, Cost	5	5
Debt securities, Gross Unrealized Gain	0	0
Debt securities, Gross Unrealized Loss	0	0
Debt securities, fair value	5	5
Marketable equity securities and mutual funds
Available-for-Sale Investments:
Equity securities, Cost	42	42
Equity securities, Gross Unrealized Gain	22	29
Equity securities, Gross Unrealized Loss	0	0
Equity securities, Fair Value	$ 64	$ 71