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Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Jul. 31, 2017
Oct. 31, 2016
Investment Holdings    
Investments in equity interests $ 2,626 $ 2,648
Period within which the funds held as collateral and posted as collateral are transferred from or to counterparties 2 days  
Collateralized arrangements in net liability position $ 509 9
Equity securities in privately held companies | Long-Term Financing Receivables and Other Assets    
Investment Holdings    
Investment amount 145 $ 128
Cash flow hedges    
Investment Holdings    
Loss expected to be reclassified from Accumulated OCI into earnings in next 12 months $ 118  
Cash flow hedges | Minimum    
Investment Holdings    
Duration of lease term for which lease-related forward contracts and intercompany lease loan forward contracts can be extended 2 years  
Cash flow hedges | Maximum    
Investment Holdings    
Duration of lease term for which lease-related forward contracts and intercompany lease loan forward contracts can be extended 5 years