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Financial Instruments - Contractual Maturities of Investments in Available-for-Sale Debt Securities (Details) - USD ($)
$ in Millions
Apr. 30, 2020
Oct. 31, 2019
Amortized Cost    
Due in more than five years $ 97  
Debt securities, Amortized Cost 97  
Fair Value    
Due in more than five years 107  
Debt securities, Fair Value 107  
Summary of Investment Holdings [Line Items]    
Investments in equity interests 2,276 $ 2,254
Equity Securities in Privately Held Companies | Long-Term Financing Receivables and Other Assets    
Summary of Investment Holdings [Line Items]    
Equity securities without readily determinable fair value 278 190
Equity securities with readily determinable fair value $ 25 $ 0