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SUPPLEMENTAL CASH FLOW INFORMATION (Cash, cash equivalents an restricted cash reconciliation) (Details) - USD ($) $ in Millions	Jul. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Oct. 31, 2018
Cash and cash equivalents	$ 1,697	$ 1,598
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	1,703	1,600	$ 1,396	$ 917
Other Current Assets [Member]
Restricted cash included in other current assets	4	0
Other Assets [Member]
Restricted cash included in other assets	$ 2	$ 2

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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