MARKETABLE SECURITIES - Contractual Maturities (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Contractual Maturities of Debt Securities, Amortized Cost
Amortized cost, due in one year or less	$ 35
Amortized cost, due after one through five years	104
Amortized cost, due after five through 10 years	87
Amortized cost, due after 10 years	52
Amortized cost, mortgage-backed securities	109
Amortized cost, debt securities	387
Contractual Maturities of Debt Securities, Fair Value
Fair value, due in one year or less	34
Fair value, due after one through five years	103
Fair value, due after five through 10 years	91
Fair value, due after 10 years	55
Fair value, mortgage-backed securities	111
Fair value, debt securities	394
Proceeds from the sales of available-for-sale securities	62	$ 120	$ 6
Losses related to impairment write-downs	$ 0	$ 0	$ 0