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RETIREMENT PLANS AND POST RETIREMENT PENSION PLANS - JWPIL (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Apr. 30, 2019
Apr. 30, 2018
Pension Plan [Member] | Foreign Plan [Member]        
Defined Benefit Plan Disclosure        
Settlement gain $ 5 $ 32 $ 0 $ 5