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ACQUISITIONS - Proforma Operating Results (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2019
Apr. 30, 2020
Business Acquisition [Line Items]    
Pro Forma Revenue $ 1,285 $ 2,611
Pro Forma Net Income $ 168 $ 642
Pro Forma Earnings Per Share, Basic $ 0.53 $ 2.20
Pro Forma Earnings Per Share, Diluted $ 0.52 $ 1.99