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Financial Instruments - Narrative (Details) - USD ($)
9 Months Ended
Jul. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Oct. 31, 2019
Derivatives, Fair Value        
Fair value of derivatives with credit contingent features in a net liability position $ 281,000,000     $ 45,000,000
Period to collateralize 2 days      
Notional amount $ 20,861,000,000     23,669,000,000
Loss expected to be reclassified from Accumulated OCI into earnings in next 12 months 221,000,000      
Floating Rate Note        
Derivatives, Fair Value        
Face amount of debt instrument $ 1,150,000,000      
Cash flow hedges        
Derivatives, Fair Value        
Foreign currency maturity 12 months      
Other Non-Current Assets | Equity securities in privately held companies        
Derivatives, Fair Value        
Cost method and other equity investments $ 43,000,000     $ 46,000,000
Treasury Lock | Cash flow hedges        
Derivatives, Fair Value        
Notional amount 750,000,000   $ 750,000,000  
Interest Rate Swap        
Derivatives, Fair Value        
Notional amount 500,000,000 $ 500,000,000    
Interest Rate Swap | Fair value hedges        
Derivatives, Fair Value        
Notional amount $ 500,000,000