STOCKHOLDER'S EQUITY - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020
Beginning Balance	$ (469)		$ (522)
Other comprehensive income (loss) before reclassifications	2		35
Amounts reclassified out of accumulated other comprehensive income (loss)	21		45
Tax expense (benefit)	(6)		(10)
Other comprehensive income (loss)	17	$ (17)	70	$ (24)
Ending Balance	(452)		(452)
Foreign Currency Translation
Beginning Balance	(152)		(194)
Other comprehensive income (loss) before reclassifications	2		44
Amounts reclassified out of accumulated other comprehensive income (loss)	0		0
Tax expense (benefit)	0		0
Other comprehensive income (loss)	2		44
Ending Balance	(150)		(150)
Prior Service Credits
Beginning Balance	125		125
Other comprehensive income (loss) before reclassifications	0		0
Amounts reclassified out of accumulated other comprehensive income (loss)	(1)		(1)
Tax expense (benefit)	0		0
Other comprehensive income (loss)	(1)		(1)
Ending Balance	124		124
Actuarial Losses
Beginning Balance	(433)		(442)
Other comprehensive income (loss) before reclassifications	0		(3)
Amounts reclassified out of accumulated other comprehensive income (loss)	16		32
Tax expense (benefit)	(4)		(8)
Other comprehensive income (loss)	12		21
Ending Balance	(421)		(421)
Unrealized Gains (Losses) on Derivatives
Beginning Balance	(9)		(11)
Other comprehensive income (loss) before reclassifications	0		(6)
Amounts reclassified out of accumulated other comprehensive income (loss)	6		14
Tax expense (benefit)	(2)		(2)
Other comprehensive income (loss)	4		6
Ending Balance	$ (5)		$ (5)