Supplementary Financial Information - Trade Receivables Sold and Cash Received (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2018
Receivables Sold but Not Collected from Third Party
Balance at beginning of year	$ 235	$ 165	$ 147
Trade receivables sold	10,474	10,257	10,224
Cash receipts	(10,526)	(10,186)	(10,202)
Foreign currency and other	5	(1)	(4)
Balance at end of year	$ 188	$ 235	$ 165