FAIR VALUE MEASUREMENTS, Fair value of assets and liabilities measured on a recurring basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Jan. 31, 2021	Oct. 31, 2020
Assets Short - term
Cash equivalents (money market funds)	$ 449	$ 740
Derivative instruments (foreign exchange contracts)	8	2
Assets, Long-term
Trading securities	31	30
Other investments	28	25
Total assets measured at fair value	516	797
Liabilities, Short-term
Derivative instruments (foreign exchange contracts)	17	17
Liabilities Long-term
Deferred compensation liability	31	30
Total liabilities measured at fair value	48	47
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets Short - term
Cash equivalents (money market funds)	449	740
Derivative instruments (foreign exchange contracts)	0	0
Assets, Long-term
Trading securities	31	30
Other investments	0	0
Total assets measured at fair value	480	770
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)	8	2
Assets, Long-term
Trading securities	0	0
Other investments	28	25
Total assets measured at fair value	36	27
Liabilities, Short-term
Derivative instruments (foreign exchange contracts)	17	17
Liabilities Long-term
Deferred compensation liability	31	30
Total liabilities measured at fair value	48	47
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
Other investments	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