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Financial Instruments - Contractual Maturities of Investments in Available-for-Sale Debt Securities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 30, 2025
Apr. 30, 2025
Apr. 30, 2024
Oct. 31, 2024
Amortized Cost        
Due in more than five years $ 114 $ 114    
Fair Value        
Due in more than five years 116 116    
Summary of Investment Holdings [Line Items]        
Decrease) in equity securities, FV-NI 38 38    
Fair Value        
Summary of Investment Holdings [Line Items]        
Equity securities without readily determinable fair value, amount 54 54   $ 88
Realized gain (loss) on equity securities 1 1    
Unrealized gain (loss) on equity securities   4 $ (54)  
Gain on equity securities   5    
Measurement Alternative        
Summary of Investment Holdings [Line Items]        
Equity securities without readily determinable fair value, amount $ 197 197   $ 200
Realized gain (loss) on equity securities   $ (2)    
Unrealized gain (loss) on equity securities     $ (7)