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OVERVIEW, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
$ in Millions
Apr. 30, 2020
Oct. 31, 2019
Apr. 30, 2019
Oct. 31, 2018
Accounting Policies [Abstract]        
Variable Interest Entity- carrying amount $ 60 $ 29    
Fair Value of Financial Instruments        
Fair value of senior notes in excess of carrying value 104 62    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents        
Cash and cash equivalents 1,324 1,382    
Restricted Cash 5 6    
Cash, cash equivalents, restricted cash and restricted cash equivalents $ 1,329 $ 1,388 $ 2,161 $ 2,254