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SEGMENT INFORMATION - Reconciliation of Reportable Results (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Reconciliation of Operating Profit from Segments to Consolidated
Total reportable segment's income from operations	$ 271	$ 257	$ 568	$ 522
Transformational initiatives	(9)	(5)	(14)	(9)
Amortization of intangible assets related to business combinations	(26)	(25)	(54)	(50)
Acquisition and integration costs	(10)	(4)	(20)	(7)
Business exit and divestiture costs	0	(8)	0	(8)
NASD site costs	(4)	(2)	(6)	(4)
Special compliance costs	(1)	(1)	(1)	(2)
Other	(5)	(2)	(7)	(3)
Interest income	10	10	20	19
Interest expense	(17)	(19)	(35)	(39)
Other income (expense), net	9	26	15	41
Income before taxes, as reported	$ 218	$ 227	$ 466	$ 460

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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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