SEGMENT INFORMATION - Reconciliation of Reportable Results (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2018	Jan. 31, 2017
Reconciliation of Operating Profit (Loss) from Segments to Consolidated
Total reportable segments’ income from operations	$ 269	$ 223
Transformational initiatives	(4)	(2)
Amortization of intangible assets related to business combinations	(25)	(31)
Acquisition and integration costs	(3)	(14)
Pension settlement gain	5	32
NASD site costs	(2)	0
Special compliance costs	(1)	0
Other	0	(2)
Interest income	9	4
Interest expense	(20)	(20)
Other income (expense), net	5	3
Income before taxes	$ 233	$ 193