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Financial Instruments - Contractual Maturities of Investments in Available-for-Sale Debt Securities (Details) - USD ($)
$ in Millions
Oct. 31, 2021
Oct. 31, 2020
Amortized Cost    
Due in one to five years $ 26  
Due in more than five years 123  
Debt securities, amortized cost 149 $ 128
Fair Value    
Due in one to five years 26  
Due in more than five years 138  
Fair Value $ 164 $ 146