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SUPPLEMENTAL CASH FLOW INFORMATION (Cash, cash equivalents an restricted cash reconciliation) (Details) - USD ($)
$ in Millions
Jul. 31, 2020
Oct. 31, 2019
Jul. 31, 2019
Oct. 31, 2018
Cash and cash equivalents $ 1,697 $ 1,598    
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows 1,703 1,600 $ 1,396 $ 917
Other Current Assets [Member]        
Restricted cash included in other current assets 4 0    
Other Assets [Member]        
Restricted cash included in other assets $ 2 $ 2