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STOCKHOLDER'S EQUITY - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2019
Apr. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ (449) $ (412) $ (488) $ (457)
Other comprehensive income (loss) before reclassifications (16) (13) 14 28
Amounts reclassified out of accumulated other comprehensive loss 7 7 18 13
Tax (expense) benefit (3) (1) (5) (3)
Other comprehensive income (loss) (12) (7) 27 38
Ending balance (461) (419) (461) (419)
Unrealized gain on equity securities [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 0 12 0 14
Other comprehensive income (loss) before reclassifications 0 (1) 0 (3)
Amounts reclassified out of accumulated other comprehensive loss 0 0 0 0
Tax (expense) benefit 0 1 0 1
Other comprehensive income (loss) 0 0 0 (2)
Ending balance 0 12 0 12
Foreign currency translation [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (30) 2 (60) (39)
Other comprehensive income (loss) before reclassifications (16) (13) 14 28
Amounts reclassified out of accumulated other comprehensive loss 0 0 0 0
Tax (expense) benefit 0 0 0 0
Other comprehensive income (loss) (16) (13) 14 28
Ending balance (46) (11) (46) (11)
Net defined benefit pension cost and post retirement plan costs, actuarial losses [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (432) (458) (445) (468)
Other comprehensive income (loss) before reclassifications 0 1 2 1
Amounts reclassified out of accumulated other comprehensive loss 12 14 26 27
Tax (expense) benefit (4) (4) (7) (7)
Other comprehensive income (loss) 8 11 21 21
Ending balance (424) (447) (424) (447)
Net defined benefit pension cost and post retirement plan costs, prior service credits [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 16 31 19 35
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified out of accumulated other comprehensive loss (5) (6) (9) (11)
Tax (expense) benefit 1 2 2 3
Other comprehensive income (loss) (4) (4) (7) (8)
Ending balance 12 27 12 27
Unrealized gain (losses) on derivatives [Member]        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (3) 1 (2) 1
Other comprehensive income (loss) before reclassifications 0 0 (2) 2
Amounts reclassified out of accumulated other comprehensive loss 0 (1) 1 (3)
Tax (expense) benefit 0 0 0 0
Other comprehensive income (loss) 0 (1) (1) (1)
Ending balance $ (3) $ 0 $ (3) $ 0