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DERIVATIVE INSTRUMENTS - Not Designated as Hedging Instruments (Details) - Not Designated as Hedging Instruments - USD ($)
$ in Millions
Jul. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Interest Rate Contracts      
Derivatives Not Designated as Hedging Instruments      
Notional amounts $ 6,087 $ 6,333 $ 5,912
Interest Rate Contracts | Purchased      
Derivatives Not Designated as Hedging Instruments      
Notional amounts 667 1,069 1,190
Interest Rate Contracts | Sold      
Derivatives Not Designated as Hedging Instruments      
Notional amounts 667 1,069 1,190
Foreign Exchange Contracts      
Derivatives Not Designated as Hedging Instruments      
Notional amounts 3,959 3,160 3,040
Cross-Currency Interest Rate Contracts      
Derivatives Not Designated as Hedging Instruments      
Notional amounts $ 64 $ 76 $ 80