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STOCKHOLDERS' EQUITY - Stock Repurchase Program (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Nov. 19, 2018	Nov. 01, 2018	May 28, 2015
2019 Repurchase Program [Member]
Share repurchase program
Share repurchase program authorized amount					$ 1,750
Stock repurchased and retired during period, (Shares)	8.0		9.8
Stock repurchased and retired during period, (Value)	$ 549		$ 674
Remaining authorized repurchase amount under share repurchase program	$ 1,076		$ 1,076
2015 Repurchase Program
Share repurchase program
Share repurchase program authorized amount							$ 1,140
Stock repurchased and retired during period, (Shares)		3.8		5.1
Stock repurchased and retired during period, (Value)		$ 243		$ 336
Remaining authorized repurchase amount under share repurchase program						$ 188

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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