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SEGMENT INFORMATION - Reconciliation of Reportable Results (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Reconciliation of Operating Profit from Segments to Consolidated        
Total reportable segment's income from operations $ 299 $ 290 $ 887 $ 858
Transformational initiatives (13) (11) (41) (25)
Amortization of intangible assets related to business combinations (45) (25) (139) (79)
Acquisition and integration costs (9) (12) (33) (32)
Asset Impairment Charges 0 0 (99) 0
Acceleration of sharebased compensation expense related to workforce reduction (1) 0 (1) 0
NASD site costs 0 (6) 0 (12)
Special compliance costs 0 (1) 0 (2)
Other (1) (10) (27) (17)
Interest income 1 10 7 30
Interest expense (19) (18) (59) (53)
Other income (expense), net 7 5 64 20
Income before taxes, as reported $ 219 $ 222 $ 559 $ 688