OVERVIEW, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Millions	Jul. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Oct. 31, 2018
Variable Interest Entity [Line Items]
Assets	$ 9,546	$ 9,452
Fair Value of Financial Instruments
Fair value of senior notes in excess of carrying value	197	62
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Cash and cash equivalents	1,358	1,382
Restricted Cash	6	6
Cash, cash equivalents, restricted cash and restricted cash equivalents	1,364	1,388	$ 1,771	$ 2,254
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Assets	$ 65	$ 29