Supplementary Financial Information - Schedule of Transferred Trade Receivables Not Collected from Third Parties (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Trade Receivables Sold and Cash Received Roll Forward
Balance at beginning of period	$ 88	$ 194	$ 235	$ 165
Trade receivables sold	2,323	2,490	5,181	5,525
Cash receipts	(2,286)	(2,498)	(5,291)	(5,507)
Foreign currency and other	(1)	(4)	(1)	(1)
Balance at end of period	$ 124	$ 182	$ 124	$ 182