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Financial Instruments - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Apr. 30, 2018
Mar. 31, 2018
Oct. 31, 2017
Investments, All Other Investments [Abstract]      
Carrying value of equity securities in privately-held companies $ 33   $ 37
Fair value of derivatives with credit contingent features in a net liability position $ 217   258
Period to collateralize 2 days    
Derivatives, Fair Value      
Notional amount $ 23,078   $ 24,573
Loss expected to be reclassified from Accumulated OCI into earnings in next 12 months $ 75    
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 | Fair value hedges      
Derivatives, Fair Value      
Notional amount   $ 1,500