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SEGMENT INFORMATION - Reconciliation of Reportable Results (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Reconciliation of Operating Profit (Loss) from Segments to Consolidated        
Total reportable segment's income from operations $ 261 $ 241 $ 530 $ 464
Transformational initiatives (5) 0 (9) (2)
Amortization of intangible assets related to business combinations (25) (31) (50) (62)
Acquisition and integration costs (4) (7) (7) (21)
Business exit and divestiture costs (8) 0 (8) 0
Pension settlement gain 0 0 5 32
NASD site costs (2) 0 (4) 0
Special compliance costs (1) 0 (2) 0
Other (1) (2) (1) (4)
Interest income 10 5 19 9
Interest expense (19) (20) (39) (40)
Other income (expense), net 21 5 26 8
Income before taxes, as reported $ 227 $ 191 $ 460 $ 384