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FAIR VALUE MEASUREMENTS, Fair value measures and impairments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Oct. 31, 2020
Investments          
Impairment of Investments $ 0 $ 0 $ 0 $ 0  
Long-Lived Assets          
Carrying value of impaired long-lived assets held for use 2 98 2 98  
Fair value of impaired long-lived assets held for use 0 0 0 0  
Impairment of Long-Lived Assets Held-for-use 2 98 2 98  
Impairment of Long-Lived assets Held for sale 0 0 0 0  
Equity Securities          
Impairment of non-marketable securities 0 0 0 0  
Unrealized gain on equity securities     11 27  
Non-marketable equity securities carrying amount 111   111   $ 103
Fair Value, Nonrecurring          
Equity Securities          
Unrealized gain on equity securities 0 11 0 27  
Fair Value, Measurements, Recurring          
Equity Securities          
Unrealized gain on equity securities $ 11 $ 0 $ 11 $ 0