Supplementary Financial Information - Schedule of Trade Receivables Sold and Cash Received (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2025	Apr. 30, 2024
Trade Receivables Sold and Cash Received [Roll Forward]
Balance at beginning of period	$ 133	$ 212	$ 284	$ 141
Trade receivables sold	3,125	2,846	6,174	6,145
Cash receipts	(3,056)	(2,873)	(6,247)	(6,106)
Foreign currency and other	15	(4)	6	1
Balance at end of period	$ 217	$ 181	$ 217	$ 181