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INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Income Tax Disclosure
Provision (benefit) for income taxes	$ 31	$ 6	$ (189)	$ 581
Effective income tax rate	14.00%	2.50%	(27.50%)	82.80%
Discrete tax expense (benefit)			$ (299)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations		$ 23		$ 23
Excess tax benefit from stock based compensation				(17)
U.S. Tax Cuts and Jobs Act of 2017
Income Tax Disclosure
Discrete tax expense related to enactment of the Tax Act				$ 533

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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