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INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		12 Months Ended
	Apr. 30, 2018	Jan. 31, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017	Oct. 31, 2018
Income Tax Disclosure
Provision for income taxes	$ 22		$ 27	$ 575	$ 52
Effective income tax rate	9.70%		14.10%	125.00%	13.50%
Net Discrete Tax Expense (Benefit)			$ (1)		$ (3)
U.S. Tax Cuts and Jobs Act of 2017
Income Tax Disclosure
Discrete tax expense (benefit)		$ 533
Net transition tax		480
Estimated provision associated with the impact of decreased U.S. corporate tax rate		53
Provisional income tax expense related to one-time transition tax		643
Income tax benefit due to reversal of deferred tax liability		$ (163)
Share-based compensation [Member]
Income Tax Disclosure
Discrete tax expense (benefit)	$ (7)			$ (18)
Pension Settlement Gain
Income Tax Disclosure
Discrete tax expense (benefit)			11
Settlement with Taxing Authority-Italy
Income Tax Disclosure
Discrete tax expense (benefit)			(7)
Return To Provision Adjustment [Member]
Income Tax Disclosure
Discrete tax expense (benefit)			$ 5		$ 5
Forecast
Income Tax Disclosure
Effective income tax rate						23.00%

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