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SUPPLEMENT CASH FLOW INFORMATION SUPPLEMENTAL CASH FLOW (Cash, cash equivalents an restricted cash reconciliation) (Details) - USD ($)
$ in Millions
Apr. 30, 2019
Oct. 31, 2018
Apr. 30, 2018
Oct. 31, 2017
Cash and cash equivalents $ 1,277 $ 913 $ 784  
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows 1,280 $ 917 786 $ 820
Other Current Assets [Member]        
Restricted cash included in other current assets 2   0  
Other Assets [Member]        
Restricted cash included in other assets $ 1   $ 2