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Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Oct. 31, 2018
Derivatives, Fair Value      
Fair value of derivatives with credit contingent features in a net liability position $ 85   $ 68
Period to collateralize 2 days    
Loss expected to be reclassified from Accumulated OCI into earnings in next 12 months $ 6    
Cash flow hedges      
Derivatives, Fair Value      
Foreign currency maturity 12 months    
Cash flow hedges | Minimum      
Derivatives, Fair Value      
Duration of the loan term (period) 2 years    
Cash flow hedges | Maximum      
Derivatives, Fair Value      
Duration of the loan term (period) 5 years    
Interest rate swap      
Derivatives, Fair Value      
Loss on interest rate swap agreements recognized in earnings $ 12 $ 40  
Other Non-Current Assets | Equity securities in privately held companies      
Derivatives, Fair Value      
Cost method and other equity investments $ 49   $ 36