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SUPPLEMENT CASH FLOW INFORMATION SUPPLEMENTAL CASH FLOW (Cash, cash equivalents an restricted cash reconciliation) (Details) - USD ($) $ in Millions	Apr. 30, 2019	Oct. 31, 2018	Apr. 30, 2018	Oct. 31, 2017
Cash and cash equivalents	$ 1,277	$ 913	$ 784
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	1,280	$ 917	786	$ 820
Other Current Assets [Member]
Restricted cash included in other current assets	2		0
Other Assets [Member]
Restricted cash included in other assets	$ 1		$ 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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