SEGMENT INFORMATION - Reconciliation of Reportable Results (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Reconciliation of Income from Operations from Segments to Consolidated
Total reportable segment's income from operations	$ 269	$ 236	$ 799	$ 700
Transformational initiatives	(5)	(3)	(14)	(5)
Amortization of intangible assets related to business combinations	(26)	(27)	(76)	(89)
Acquisition and integration costs	(7)	(4)	(14)	(25)
Business exit and divestiture costs	(1)	0	(9)	0
Pension settlement gain	0	0	5	32
NASD site costs	(2)	0	(6)	0
Special compliance costs	(1)	0	(3)	0
Other	(2)	(1)	(3)	(5)
Interest income	9	6	28	15
Interest expense	(18)	(19)	(57)	(59)
Other income (expense), net	26	5	52	13
Income before taxes, as reported	$ 242	$ 193	$ 702	$ 577