FAIR VALUE MEASUREMENTS - Recurring, Level 3 Measurements (Details) - Assets and Liabilities Measured at Fair Value on a Recurring Basis - Level 3 - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Fair Value, Recurring, Level 3 Measurements from Available for Sale Marketable Securities
Beginning of period balance	$ 40		$ 29
Purchases		$ 30	25	$ 30
Principal payments	(8)		(16)
Change in unrealized gain (loss)	2	1	(4)	1
End of period balance	$ 34	$ 31	$ 34	$ 31