Supplementary Financial Information - Schedule of Transferred Trade Receivables Not Collected from Third Parties (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Trade Receivables Sold and Cash Received Roll Forward
Balance at beginning of period	$ 171	$ 123	$ 147	$ 149
Trade receivables sold	2,404	2,268	7,773	6,969
Cash receipts	(2,427)	(2,269)	(7,778)	(6,997)
Foreign currency and other	(5)	8	1	9
Balance at end of period	$ 143	$ 130	$ 143	$ 130