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Financial Instruments (Details 2) - USD ($)
$ in Millions
Oct. 31, 2018
Oct. 31, 2017
Amortized Cost    
Due in more than five years $ 139  
Fair Value    
Due in more than five years 156  
Investment Holdings    
Investments in equity interests 2,398 $ 2,535
Equity securities in privately held companies | Long-Term Financing Receivables and Other Assets    
Investment Holdings    
Investment amount $ 162 $ 149