OVERVIEW, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions	Apr. 30, 2021	Oct. 31, 2020	Apr. 30, 2020	Oct. 31, 2019
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Cash and cash equivalents	$ 1,380	$ 1,441
Restricted Cash	7	6
Cash, cash equivalents, restricted cash and restricted cash equivalents	1,387	1,447	$ 1,329	$ 1,388
Variable Interest Entity
Assets	10,398	9,627
Fair Value of Financial Instruments
Fair value of senior notes in excess of carrying value	79	162
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity
Assets	53	67
Other Assets
Operating Leases
Right-of-Use Asset	186	175
Other accrued and long-term liabilities
Operating Leases
Present value of future minimum lease payments	$ 191	$ 178