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LONG-TERM DEBT - Text (Details) - USD ($) $ in Millions					9 Months Ended
	Apr. 05, 2021	Mar. 12, 2021	Jan. 21, 2021	Sep. 13, 2012	Jul. 31, 2021	Jul. 31, 2020
Debt Instrument
Early Repayment of Senior Debt					$ 417	$ 0
Loss on extinguishment of debt					17	$ 0
Senior Notes 2022
Debt Instrument
Issuance date of debt				Sep. 13, 2012
Aggregate face amount of debt				$ 400
Percentage Of Face Amount Of Senior Note Instrument Issued				99.80%
Maturity date of debt				Oct. 01, 2022
Fixed interest rate per annum				3.20%
Debt interest payment frequency				semi-annually
Date interest payment commenced				Apr. 01, 2013
Repayments of Senior Debt	$ 300		$ 100
Early Repayment of Senior Debt					417
Loss on extinguishment of debt					17
Payment of accrued and unpaid interest					$ 1
Senior Notes 2031
Debt Instrument
Issuance date of debt		Mar. 12, 2021
Aggregate face amount of debt		$ 850
Percentage Of Face Amount Of Senior Note Instrument Issued		99.822%
Maturity date of debt		Mar. 12, 2031
Fixed interest rate per annum		2.30%
Date interest payment commenced		Sep. 12, 2021

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