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RETIREMENT PLANS AND POST RETIREMENT PENSION PLANS- Components of net periodic costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Pension Plan | United States        
Defined Benefit Plan, Net Periodic Benefit Cost        
Service cost - benefits earned during the period $ 0 $ 0 $ 0 $ 0
Interest cost on benefit obligation 4 5 8 10
Expected return on plan assets (7) (7) (15) (14)
Amortization:        
Actuarial losses 1 0 2 0
Prior service credits 0 0 0 0
Total net plan costs (benefits) (2) (2) (5) (4)
Pension Plan | Foreign Plan        
Defined Benefit Plan, Net Periodic Benefit Cost        
Service cost - benefits earned during the period 5 4 12 10
Interest cost on benefit obligation 2 3 4 6
Expected return on plan assets (12) (11) (24) (22)
Amortization:        
Actuarial losses 12 9 24 18
Prior service credits 0 0 0 0
Total net plan costs (benefits) 7 5 16 12
Other Postretirement Benefits Plan | United States        
Defined Benefit Plan, Net Periodic Benefit Cost        
Service cost - benefits earned during the period 0 0 0 0
Interest cost on benefit obligation 1 1 2 1
Expected return on plan assets (2) (1) (3) (2)
Amortization:        
Actuarial losses 1 1 2 2
Prior service credits (2) (2) (4) (4)
Total net plan costs (benefits) $ (2) $ (1) $ (3) $ (3)