STOCKHOLDERS' EQUITY - Stock Repurchase Program (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020	Feb. 18, 2021	Nov. 19, 2018
2019 Repurchase Program [Member]
Share repurchase program
Share repurchase program authorized amount						$ 1,750
Shares repurchased and retired during period, (Shares)	164,422	1,663,000	3,050,000.000	2,389,000
Shares repurchased and retired during period, (Value)	$ 21	$ 126	$ 365	$ 186
Remaining authorized repurchase amount under share repurchase program					$ 193
2021 Repurchase Program [Member]
Share repurchase program
Share repurchase program authorized amount					$ 2,000
Shares repurchased and retired during period, (Shares)	1,388,000		1,388,000
Shares repurchased and retired during period, (Value)	$ 174		$ 174
Remaining authorized repurchase amount under share repurchase program	$ 1,826		$ 1,826