Financial Instruments - Schedule of Cash Equivalents and Available-for-Sale Investments (Details) - USD ($) $ in Millions	Oct. 31, 2025	Oct. 31, 2024
Cash Equivalents:
Cost	$ 1,878	$ 1,332
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	1,878	1,332
Available-for-Sale Investments:
Cost	107	118
Gross Unrealized Gain	27	69
Gross Unrealized Loss	0	0
Fair Value	134	187
Total cash equivalents and available-for-sale investments, cost	1,985	1,450
Total cash equivalents and available-for-sale investments, gross unrealized gain	27	69
Total cash equivalents and available-for-sale investments, gross unrealized loss	0	0
Total cash equivalents and available-for-sale investments, fair value	2,012	1,519
Government debt
Cash Equivalents:
Cost	1,878	1,332
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	1,878	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	104	115
Equity securities, gross unrealized gain	27	69
Equity securities, gross unrealized loss	0	0
Equity securities, fair value	131	184
Debt securities, restricted	$ 63	$ 78