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FAIR VALUE MEASUREMENTS, Fair value measures and impairments (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Oct. 31, 2019
Long-Lived Assets      
Impairment of Long-Lived Assets Held-for-use $ 0 $ 0  
Impairment of non-marketable securities 0    
Impairment of long-lived assets held for sale 0 0  
Investments      
Impairment of Investments 0 0  
Non-Marketable Equity Securities without Readily Determinable Fair Value      
Unrealized gain on equity securities 16 $ 0  
Non-marketable equity securities carrying amount $ 63   $ 47