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INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Jul. 31, 2018	Jan. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Income Tax Disclosure
Provision for income taxes	$ 6		$ 18	$ 581	$ 70
Effective income tax rate	2.50%		9.30%	82.80%	12.10%
Net Discrete Tax Expense (Benefit)			$ (60)		$ (63)
Unrecognized tax benefits reduction resulting from lapse of applicable statute of limitations	$ 23				$ 40
U.S. federal corporate tax rate		21.00%						35.00%
Excess tax benefit from stock-based compensation	$ 17
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)
Settlement with Taxing Authority-Germany
Income Tax Disclosure
Discrete tax expense (benefit)			$ (51)
Forecast
Income Tax Disclosure
U.S. federal corporate tax rate						21.00%	23.00%

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