STOCKHOLDERS' EQUITY - Reclassifications out of accumulated comprehensive income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives
Unrealized gain (loss) on derivatives	$ (6)	$ 1	$ (14)	$ 1
Reclassification of (gains) and losses into earnings related to derivative instruments, tax	2	0	4	0
Unrealized gains and (losses) on derivatives reclassified to cost of products, net of tax	(4)	1	(10)	1
Actuarial net loss	(16)	(14)	(32)	(28)
Prior service benefit	1	2	1	4
Actuarial net loss and prior service benefit reclassified, before tax	(15)	(12)	(31)	(24)
Tax on actuarial net loss and prior service benefit reclassified	4	2	8	8
Actuarial net loss and prior service benefit reclassified, net of tax	(11)	(10)	(23)	(16)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(15)	(9)	(33)	(15)
Cost of Products and Services
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives
Unrealized gain (loss) on derivatives	(6)	2	(14)	2
Interest Expense
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives
Unrealized gain (loss) on derivatives	$ 0	$ (1)	$ 0	$ (1)