Financial Instruments - Schedule of Cash Equivalents and Available-for-Sale Investments (Details) - USD ($) $ in Millions	Jul. 31, 2025	Oct. 31, 2024
Cash Equivalents:
Cost	$ 2,171	$ 2,344
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	2,171	2,344
Available-for-Sale Investments:
Cost	113	118
Gross Unrealized Gain	21	69
Gross Unrealized Loss	0	0
Fair Value	134	187
Total cash equivalents and available-for-sale investments, cost	2,284	2,462
Total cash equivalents and available-for-sale investments, gross unrealized gain	21	69
Total cash equivalents and available-for-sale investments, gross unrealized loss	0	0
Total cash equivalents and available-for-sale investments, fair value	2,305	2,531
Time deposits
Cash Equivalents:
Cost	1,773	1,012
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	1,773	1,012
Government debt
Cash Equivalents:
Cost	398	1,332
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	398	1,332
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	110	115
Equity securities, gross unrealized gain	21	69
Equity securities, gross unrealized loss	0	0
Equity securities, fair value	131	184
Marketable securities and mutual funds | Fair Value Measured on a Recurring Basis
Available-for-Sale Investments:
Debt securities, restricted	$ 67	$ 78