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SHORT-TERM DEBT - Senior Notes (Details) - USD ($) $ in Millions				12 Months Ended
	Sep. 17, 2019	Aug. 09, 2011	Jul. 13, 2010	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Short-term Debt [Line Items]
Early Repayment of Senior Debt				$ 417	$ 0	$ 0
Senior Notes 2020
Short-term Debt [Line Items]
Issuance date of debt			Jul. 13, 2010
Debt Instrument, Face Amount			$ 500
Percentage Of Face Amount Of Senior Note Instrument Issued			99.54%
Maturity date			Jul. 15, 2020
Fixed interest rate per annum (in hundredths)			5.00%
Debt Instrument, Redemption Period, End Date	Sep. 17, 2019
Early Repayment of Senior Debt	$ 500
Early repayment of senior notes including prepayment penalty	512
Early repayment of senior notes prepayment penalty	12
accelerated amortization of interest rate swap gain	4
Amortization of Debt Issuance Costs and Discounts	1
Debt Instrument, Increase, Accrued Interest	$ 4
Senior Notes 2020
Short-term Debt [Line Items]
Interest Rate Derivatives Terminated Date		August 9, 2011
Notional Amount Of Terminated Interest Rate Fair Value Hedge Derivatives		$ 500
Terminated Interest Rate Fair Value Hedge Derivative Assets At Fair Value		$ 34

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