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SEGMENT INFORMATION - Reconciliation of Reportable Results (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Reconciliation of Operating Profit from Segments to Consolidated
Total reportable segment's income from operations	$ 277	$ 271	$ 588	$ 568
Transformational initiatives	(15)	(9)	(28)	(14)
Amortization of intangible assets related to business combinations	(46)	(26)	(94)	(54)
Acquisition and integration costs	(11)	(10)	(24)	(20)
Asset Impairment Charges	(99)	0	(99)	0
NASD site costs	0	(4)	0	(6)
Special compliance costs	0	(1)	0	(1)
Other	(4)	(5)	(26)	(7)
Interest income	3	10	6	20
Interest expense	(20)	(17)	(40)	(35)
Other income (expense), net	36	9	57	15
Income before taxes, as reported	$ 121	$ 218	$ 340	$ 466

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Amount of an item in the reconciliation of total profit or loss from reportable segments, to the entity's consolidated income before income taxes, extraordinary items, discontinued operations.

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The net result for the period of deducting segment operating expenses from segment operating revenues.

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