Supplementary Financial Information - Trade Receivables Sold and Cash Received (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Receivables Sold but Not Collected from Third Party
Balance at beginning of year	$ 165	$ 147	$ 149
Trade receivables sold	10,257	10,224	9,553
Cash receipts	(10,186)	(10,202)	(9,562)
Foreign currency and other	(1)	(4)	7
Balance at end of year	$ 235	$ 165	$ 147