Financial Instruments - Schedule of Cash Equivalents and Available-for-Sale Investments (Details) - USD ($) $ in Millions	Jan. 31, 2024	Oct. 31, 2023
Cash Equivalents:
Cost	$ 1,531	$ 2,489
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	1,531	2,489
Available-for-Sale Investments:
Cost	43	43
Gross Unrealized Gain	52	38
Gross Unrealized Loss	0	0
Fair Value	95	81
Total cash equivalents and available-for-sale investments, cost	1,574	2,532
Total cash equivalents and available-for-sale investments, gross unrealized gain	52	38
Total cash equivalents and available-for-sale investments, gross unrealized loss	0	0
Total cash equivalents and available-for-sale investments, fair value	1,626	2,570
Corporate debt
Cash Equivalents:
Cost	502	589
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	502	589
Government debt
Cash Equivalents:
Cost	1,029	1,900
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	1,029	1,900
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	40	40
Equity securities, gross unrealized gain	52	38
Equity securities, gross unrealized loss	0	0
Equity securities, fair value	$ 92	$ 78