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Financial Instruments - Narrative (Details) - USD ($)
6 Months Ended
Apr. 30, 2020
Mar. 31, 2020
Oct. 31, 2019
Derivatives, Fair Value      
Fair value of derivatives with credit contingent features in a net liability position $ 29,000,000   $ 45,000,000
Period to collateralize 2 days    
Loss expected to be reclassified from Accumulated OCI into earnings in next 12 months $ 236,000,000    
Notional amount $ 21,815,000,000   23,669,000,000
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 $ 40,000,000   $ 46,000,000
Treasury Lock | Cash flow hedges      
Derivatives, Fair Value      
Notional amount   $ 750,000,000