FAIR VALUE MEASUREMENTS, Fair value of assets and liabilities measured on a recurring basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Jan. 31, 2018	Oct. 31, 2017
Assets Short - term
Cash equivalents (money market funds)	$ 1,960	$ 1,659
Derivative instruments (foreign exchange contracts)	9	4
Assets, Long-term
Trading securities	31	32
Total assets measured at fair value	2,000	1,695
Liabilities, Short-term
Derivative instruments (foreign exchange contracts)	16	6
Liabilities Long-term
Deferred compensation liability	31	32
Total liabilities measured at fair value	47	38
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets Short - term
Cash equivalents (money market funds)	1,960	1,659
Derivative instruments (foreign exchange contracts)	0	0
Assets, Long-term
Trading securities	31	32
Total assets measured at fair value	1,991	1,691
Liabilities, Short-term
Derivative instruments (foreign exchange contracts)	0	0
Liabilities Long-term
Deferred compensation liability	0	0
Total liabilities measured at fair value	0	0
Significant Other Observable Inputs (Level 2)
Assets Short - term
Cash equivalents (money market funds)	0	0
Derivative instruments (foreign exchange contracts)	9	4
Assets, Long-term
Trading securities	0	0
Total assets measured at fair value	9	4
Liabilities, Short-term
Derivative instruments (foreign exchange contracts)	16	6
Liabilities Long-term
Deferred compensation liability	31	32
Total liabilities measured at fair value	47	38
Significant Unobservable Inputs (Level 3)
Assets Short - term
Cash equivalents (money market funds)	0	0
Derivative instruments (foreign exchange contracts)	0	0
Assets, Long-term
Trading securities	0	0
Total assets measured at fair value	0	0
Liabilities, Short-term
Derivative instruments (foreign exchange contracts)	0	0
Liabilities Long-term
Deferred compensation liability	0	0
Total liabilities measured at fair value	$ 0	$ 0